Here is a Retro book for you to take a look at and learn from. This book is called Draw Cartoons: It's Fun to Know How. This drawing tutorial book shows you the author's way of drawing cartoons and comics. It is a very old book, so of course, these are old techniques, but they are still great techniques to learn. This book goes over drawing cartoon faces, hands, feet, facial expressions, etc. I think you will have fun taking a look at it.
Learn how to draw Jimmy Neutron from the animated TV show on Nickelodeon ... The Adventures of Jimmy Neutron: Boy Genius. Although he is a computer animated creation, we will show you how to draw Jimmy as a line drawing. Find out how to draw him easily, with step by step instructions on the following page.