Headgear Tutorial by Solthrys
Manga artist Solthrys shared this tutorial for fitting items over heads and feet (hats, hoods, shoes, etc.)

Headgear tutorial by Solthrys
Click it: Headgear and footwear tutorial by Solthrys on Tumblr
Head in Perspective
Nice how-to example of drawing the human head from various angles and in perspective.