Bridget Erdmann
Little Critter was created in 1975.
Poor Little Critter on the Road was created in 1984.
Cathy Cassidy's books are not illustrated so they do not have a illustrator :-)
Helen Sewell (and Mildred Boyle for some books) was the first illustrator of the "Little House" books. In 1953, the new editions were published with Garth Williams' illustrations.
Roderick Hunt is the author of the Biff and Chip books.
A Little Salamander-Like Critter
Dav Pilkey is the author and illustrator of the Captain Underpants books. There are 14 books and 3 spin offs of this series. It has sold more than 40 millions books worldwide.
A person who draws or creates pictures for magazines, books, advertising, etc is called an illustrator and they do graphic design.
She gets them from the illustrator.
Lovorambo
dr. Seuss illustrated most of his books
I believe the author, Norman Bridwell, is the illustrator of all of the official Clifford books.