The blog post is nice enough, but make sure you catch the comment from "onjibonrenat" - I got more out of that than the post itself.
http://ben.casnocha.com/2010/11/how-to-draw-an-owl.html#comm...
The 30 Steps to Mastery
http://ben.casnocha.com/2010/11/the-30-steps-to-mastery.html