You should contact this team of book illustrators: http://www.w3illustration.com
Nick Sharrat illustrates Jeremy Strong's books as well as Jacqueline Wilson and a few other authors.
An illustrator. Or if they only draw your cover, they are called a cover artist.
Mr. Blobby jesus!?!?!?!?!?
no she doesn't. she gets different illustraters to illustrate all her books.
I would recommend these guys for children books illustrations: http://www.w3illustration.com
Interview With Comic Book Illustrator Dale Eagelsham
Interview With Veteran Comic Book Artist Herb Trimpe
Amira Dvorah's Book Cover Illustrations
How to Write a Book for Children: Do I Need an Illustrator?