I'm not into drawing, but Matt Groening's "The Simpsons Handbook" caught my eye. Matt makes drawing his characters as easy as possible. By using this book, you can draw any "Simpsons" character just by combining simple geometric figures. I'm uploading one page, that shows Homer's head step-by-step drawing.
Homer Simpson drawing guide. Tags: animation, drawing. Source: "The Simpsons Handbook"
If you like this then you should find the full book for more "Simpsons" awesomeness.