How to Illustrate a Children’s Book (and When to Hire Instead)

This guide is for authors who want to draw their own picture book. It walks through the process in the order professionals use, with exact canvas sizes in pixels for common trim sizes. If you’d rather hand the art to someone else, our children’s book illustration services start from the same brief you’ll build here.

Canvas sizes for common picture book trim sizes

Set up your files at these sizes before you draw. Each one adds the bleed Amazon KDP asks for (0.125 inch at the top, bottom, and outside edge) at 300 DPI. A spread is two pages painted as one canvas, then split at the fold.

Trim size (inches)	Shape	One page with bleed	One page in pixels	Full spread with bleed	Full spread in pixels
8.5 x 8.5	Square	8.625 x 8.75 in	2,588 x 2,625	17.25 x 8.75 in	5,175 x 2,625
8.25 x 8.25	Square	8.375 x 8.5 in	2,513 x 2,550	16.75 x 8.5 in	5,025 x 2,550
8 x 10	Tall	8.125 x 10.25 in	2,438 x 3,075	16.25 x 10.25 in	4,875 x 3,075
8.5 x 11	Tall	8.625 x 11.25 in	2,588 x 3,375	17.25 x 11.25 in	5,175 x 3,375
8.25 x 6	Wide	8.375 x 6.25 in	2,513 x 1,875	16.75 x 6.25 in	5,025 x 1,875

Step 1: Read the manuscript and mark the page turns

Start with the words, not the pictures. Read the manuscript aloud and mark where each page turn falls, because every turn is a chance for a small surprise.

Write one line for each spread: what the reader sees, what the words leave out, and where the eye should land. If you wrote the manuscript yourself, the spread notes from our writing guide become your plan.

Step 2: Choose the trim size and shape first

Your trim size (the book’s finished page size) decides your canvas, so choose it before any final art. Changing it later means repainting edges or cropping faces.

Shape follows the story. A square book suits concept books for the youngest readers, a tall one suits character stories, and a wide one suits travel stories and big scenes. If you plan a board book, its printer sets different templates; see what a board book is before you start.

One KDP rule catches picture book authors: standard color ink needs at least 72 pages, so a 32-page book must use premium color (as of October 2026).

Step 3: Design the main character before any page

Draw the main character until you can repeat it from memory. Children notice when a stripe disappears or a coat changes color.

Make one reference sheet with:

1. Front, side, and back views.
2. Five or six expressions: happy, sad, scared, angry, surprised, sleepy.
3. Size next to other characters and a doorway.
4. Color swatches, with exact values if you work digitally.
5. Small marks to keep: a freckle, a patch, a missing tooth.

Keep this sheet beside you for every page.

Step 4: Thumbnail every spread, then make a dummy

Thumbnails are tiny, rough sketches, about the size of a sticky note. Draw one for every spread so you see the whole book at once.

Then paste them into a dummy, a folded rough copy of the book you can flip like a reader. Our guide to writing a children’s book shows how to fold one from 8 sheets of paper. Flipping it shows the spreads that feel crowded, the turns that fall flat, and two similar scenes side by side.

Step 5: Draw tight sketches with room for the words

Tight sketches are clean pencil drawings at full size, with every character, prop, and background in place. This is the stage to fix poses and composition, because changes after color cost hours.

Leave a quiet area for the text on each spread, such as sky, a wall, or a plain floor. Place the words in the sketch file now, in the font size you plan to use, so you know they fit.

Step 6: Finish one test spread, then time it

Paint one complete spread before the rest. It settles your palette, your brushes, and your light direction, and it tells you how long the book will really take.

Track the hours from tight sketch to finished color, then use this formula:

Hours for one spread x number of spreads x 1.25 = your estimate

The extra 25% covers fixes and consistency checks. Worked example: a test spread takes 10 hours, the book has 14 spreads, and the cover counts as one more. That’s 10 x 15 x 1.25 = 187.5 hours. At 10 hours a week, plan on about 19 weeks. Your numbers will differ, which is the point of timing your own spread.

Step 7: Paint the rest and check consistency

Work through the spreads in batches, not one at a time from start to finish. Painting all the skies, then all the characters, keeps colors matched across the book.

Before you call the art done, lay every spread side by side and check:

• The character’s marks, clothes, and proportions on every page.
• The same light direction within each scene.
• Colors that match from spread to spread.
• A clear spot for the text on each page.
• Nothing important outside the safe zone lines (next step).

Step 8: Prepare print-ready files

Print files need more care than screen images. Use these settings, all checked against KDP’s specs in October 2026:

Setting	What to use
Resolution	300 DPI at the final printed size
Bleed	0.125 inch past the trim on the top, bottom, and outside edges
Safe zone	Keep text and faces at least 0.375 inch inside the trim
Gutter (the inside fold)	0.375 inch minimum for 24 to 150 pages; keep faces and words well clear of it
Color	IngramSpark needs CMYK; KDP accepts RGB and converts it
Traditional art	Scan at 600 DPI or more, so you can clean and resize without losing detail

One spread, four lines to know

A picture book spread as you paint it. Keep text and faces inside the dashed safe zone on each page, and out of the gutter strip in the middle.

• 1Bleed: art runs 0.125 inch past the trim, then gets cut off.
• 2Trim line: where the printed page ends.
• 3Safe zone: text and faces stay at least 0.375 inch inside the trim.
• 4Gutter: the fold, where pages curve into the binding.
• XMistake: a face across the fold disappears in the printed book.

A paperback’s pages curve into the binding, so anything near the fold disappears. Painted spreads are split into two single pages for KDP, and the inside edges get no bleed.

The finished art then goes into a book interior with the text, front matter, and page numbers, for print and for Kindle. That’s a separate job; our picture book formatting covers it, and our guide to publishing a children’s book covers uploading.

Mistakes that show up in the printed proof

Order a printed proof before you publish. These are the problems it reveals:

1. Art drawn too small. A canvas set to screen size looks blurry in print. Start at 300 DPI at the final size.
2. No bleed. Art painted only to the trim line leaves thin white slivers at the edges.
3. Faces in the fold. A nose or an eye in the gutter vanishes into the binding.
4. Text on a busy background. Words over grass or patterns are hard for a child to follow.
5. Character drift. A tail with one stripe on page 6 and two on page 18 makes the book feel off.
6. Screen-bright colors. Neon greens and electric blues look duller on paper. Judge color from the proof, not the screen.

When to hire an illustrator instead

Hiring makes sense when the art would hold the book back or the timeline doesn’t work. Four signs:

• Your time estimate from Step 6 lands well past your launch date.
• The character still changes from page to page after several reference sheets.
• You want a look you can’t yet produce; browse our children’s book illustration styles to name it.
• You’re planning a series and need the same character for years.

You can also keep drawing and get a professional eye on the sketches. A sketch review from our children’s book editors checks pacing, page turns, and text space before you paint. Thinking of AI art instead? Check the rules for AI-illustrated children’s books first.

FAQ

How long does it take to illustrate a children’s book?

It depends on your style, speed, and the number of spreads. The best way to know is to finish one spread and time it, from tight sketch to final color. Multiply those hours by your number of spreads plus the cover, then add 25% for fixes. At 10 hours a spread, a 14-spread book comes to about 188 hours, or roughly 19 weeks at 10 hours a week.

Can I illustrate my own children’s book if I’m not a trained artist?

Yes, if your style is consistent and suits the story. Simple shapes, collage, and loose line art work well in picture books. What matters is drawing the same character the same way on every page and leaving clear space for the words. Finish one test spread and order a printed proof. If the character drifts or the art fights the text, consider a sketch review or an illustrator.

What resolution should children’s book illustrations be?

Work at 300 DPI at the final printed size, with 0.125 inch of bleed on every edge that reaches the trim. For an 8.5 x 8.5 inch book, one page with bleed is 2,588 x 2,625 pixels, and a full spread is 5,175 x 2,625 pixels. If you paint by hand, scan at 600 DPI or more so you can clean and resize the art.

Does every page of a picture book need an illustration?

Almost every story spread does, because picture book art carries half the story. The title page, copyright page, and dedication can be text only or use a small spot illustration. Some spreads use one large image across both pages, others use a vignette on each side. Early readers and chapter books need fewer pictures, often one every page or two, or chapter openers only.

Related reading: What is a board book? · How to write a children’s book · How to publish a children’s book