Of course, comic book artists must know how to draw well, but there's a lot more to drawing a comic book than just knowing how to draw. Cartoonists must work according to specific guidelines on a deadline to produce lots of drawings that tell a story. Foundations in Comic Book Art, by industry veteran John Paul Lowe (DC, Marvel, Dark Horse), outlines the techniques, shortcuts, and tools that a beginning cartoonist needs to know to get started. He's an instructor at The Savannah College of Art and Design, and the lessons in this book, which include using traditional and electronic media, were created to help cartoonists efficiently and effectively produce quality comic book art.
Foundations in Comic Book Art by John Paul Lowe