[Captain.Remy]

Originally Posted by rusticgal

Best selling PICTURE book....all credit to the Illustrator.

Authors and illustrators work together to create the finished product.
It's not a process where the author sends it and is done with it, then the illustrator picks it up and does their work. It's a common effort and vision to make a picture book happen.
So no, not all credit goes to the illustrator.