Hi!
I am a childrens book illustrator, (please, take a look at my portfolio here on freelancer).
Also, I can provide you a correct prepress (I work as a creative manager in a publishing company, so I have many experiences in this kind of work).
If you want, you can send me a few lines from your book and I can give you example of illustration, so you can tell if you want to cooperate.
Have a nice day!
All best
Magdalena