Horn tutorial (in German, but the pictures are reasonably easy to follow)
cthulhu-with-a-fez: How to make horns by ~MonkeyNumber5 I can see this being incredibly helpful for a lot of cosplayers - Homestucks in particular.
How to draw eyes
brittany schall - mixed media drawings
11 Interesting And Useful Hair Tutorials For Every Day, DIY Style a Cute Side Braid Hairstyle
Raving Lunatic - martinekenblog:Beautiful drawings by Chelsea... Love the use of color
Famous Works of Art Improved by Cats