Hi, Writingislife and welcome to WriteWords
To echo Freebird, come over to childrens and you'll find a number of keen childrens writers who can help oyu out.
One thing to bear in mind is childrens picture books are for the 3-5yr age group, and there are word count considerations depending on the story and book size.
If you need any help navigating the site feel free to ask.
- NaomiM