I love drawing afros. If you follow me and my convention sketch posts, one of my favorite things I've ever drawn was Spider-Man with an afro and a pick webbed to his hair. IT. WAS. AWESOME.
Anyhoo, with my new brush I got for Christmas, I noticed I can pull a lot of texture from the cardboard and the ink gets darker the more times you go over so it gave the hair some depth and volume. Fun stuff.