Illustrate humorous books

I have a variety of books to be illustrated. Adult humor books as well as children's books. Each book requires 10-12 illustrations (many with full background). Files should be made in .jpg and .pdf form at the required size with minimum 300 dpi. I like to have one artist do a whole series for me so the illustrations match across all books. I've attached copies of the illustration style I like for your reference. This is my first time using freelancer, so please be patient with me while I figure out how this all works! :) I would be willing to pay by the hour if the artist prefers, but would want a time estimate.