This came about after talking to a friend who said he wanted to improve at art but didn't know how to break out of his rut and try something different. I started drawing this as a "this is the easiest way to draw a relatively satisfactory cartoon head" thing and it just ballooned out from there. It doesn't cover proportions and stuff like that because there are a billion billion tutorials and anatomy books that can tell you "a person is so many heads tall, a head is so many eyes wide, ect". I made this because no one else seemed to have a quick reference for origin and insertion points.
This has been up in my DA gallery for a while, but people have been asking for a printer-friendly version so I'm uploading the individual pages here.