In this informative companion to the popular "What Do Authors Do?" author/illustrator Christelow turns her attention to the visual side of creating a picture book. Employing her relaxed style and trademark humor, she shows how an illustrator develops a book from rough sketches to finished artwork, following two artists as they illustrate different versions of "Jack and the Beanstalk." Christelow answers the questions often posed by children, such as, "What materials do you use?" and "Is it hard to be an illustrator?" and reveals that the uniqueness of each book depends on many creative choices . . . and a lot of painstaking work.