You can take these drawing lessons at http://www.animationarchive.org/2006/05/meta-100000-animation-drawing-course.html and http://johnkstuff.blogspot.com/.
This drawing is very inaccurate, which surprised me, because I thought it looked very good as I was drawing it. If anyone can tell me how to upload photoshop images onto the blog (Blogger always says "Error" when I try to upload images), I would appreciate it.