Putting together a cover for a children's book is one of those jobs that looks simple until you actually try it. You need a character that stays recognizable, a mood that matches the story, and space for a title that won't fight with the art. Doing it by hand can take weeks. Doing it with generation tools can also take weeks if you don't have a plan. Here's the workflow that keeps me sane, using the same approach I'd recommend on aiimagegenerators.net for any illustration project.
Start with the story, not the tool
Before you type a single prompt, write down three things: who the main character is, what emotion the cover should carry, and where the title will sit. A cover for a bedtime story about a shy rabbit reads completely differently from an adventure about a lost robot. If you skip this step you'll generate twenty pretty pictures that all feel wrong, and you won't know why.
Lock your character first
The hardest part of any picture book is consistency. Readers will notice instantly if the rabbit's ears change shape between the cover and page three. So before you even think about composition, generate your character on its own. Keep a short description handy and reuse it word for word every time: age, species or build, clothing colors, one or two distinctive features. Don't get creative with the wording between attempts. Same words in, same character out.
Once you have a version you like, save it and treat it as your reference sheet. Some tools let you feed that image back in as a style or character reference, which is far more reliable than hoping the text description does the whole job.
Build the scene in layers
New illustrators try to describe the entire cover in one prompt and then wonder why the results look muddy. Instead, build it up. First generate the background on its own: the room, the forest, the spaceship. Get the lighting and palette right while nothing else is competing for attention. Then bring the character into that setting. You're giving yourself two problems to solve instead of ten at once.
If your tool supports it, use inpainting to drop the character in rather than regenerating the whole scene. That way a good background doesn't get thrown away because the pose came out wrong.
Leave room for the title
This is the mistake I see most often. People generate a gorgeous, busy composition and then realize there's nowhere to put the book's name. Decide before you generate whether the title goes across the top, the bottom, or in an open area. Then describe that emptiness in your prompt. Words like "open sky at the top" or "soft uncluttered foreground" give you breathing room. A little negative space isn't lazy art, it's planning.
Match the age group
A cover for toddlers wants bold shapes, high contrast, and simple faces. A middle-grade novel can handle more detail and subtler color. Show the same image to someone who knows the target age and watch their reaction. If they squint, the shapes are too small. If the colors feel muted, warm them up. Cute and scary are separated by surprisingly small shifts in proportion and contrast.
Refine, don't restart
When something is close but not quite right, resist the urge to start over. Adjust one variable at a time: the lighting direction, the character's expression, the background density. Changing three things at once means you'll never know which change helped. Keep your favorite version from each round so you can go back if you overshoot.
Final checks before you commit
Shrink the cover down to thumbnail size. If the character and the mood still read clearly at that scale, you've got a cover that works in a shop listing. Check that the character's clothing and colors match every other illustration you've made for the book. And read the title out loud over the image once, just to make sure nothing important sits behind a busy detail.
None of this requires a fine-art background. It requires patience with the process and the discipline to solve one problem at a time. If you want to experiment with different styles before committing, aiimagegenerators.net is a good place to run quick tests without installing anything. Do the planning, keep the character consistent, and the cover will come together faster than you expect.