I need a Children's book illustrator

I'm writing a Children's book about a boy, his toy teddy bear and navigating life with autism. I need an illustrator to come up with ideas for a series (maybe 15 books in total) but I want to see mock ups of the main characters first to get an idea of your style. The main characters are Tristan, a young boy with autism, his brown, fluffy bear (medium size) named Yobby, his Mother, Grandparents and Uncle.