Messstudios was recently involved in some Street Fighter illustrations for Udon.
You can read a little more about that here [link]
Gotta have your warm up pieces though. And that's where little ol' Sakura came in (character of Capcom).
Art by HOON
The Hadouken Thumb: A condition of great severity, wherein the joint of your thumb becomes hardened with a thick callous. This phenomena occurs after a person spends too many hours rolling to the movements of a hadouken in Street Fighter.