Crazy Neko's Art

A sketch of MangaPunkSai's character, Satan. In her story, Satan is the Angel of Retribution, in charge of punishing souls and keeping Lucy from coming up here? ^^

Here's a sketch. I plan on inking it. But I'm not sure weither to color it in Photoshop or color it with markers. I'll probably do both, so expect the inked version to be scanned sometime.