I love this because it is probably the most realistic picture you've ever drawn. It looks exactly how he woudl in real life. It reminds me of those "Untoon" pictures. This turned out to not be as scary, probably because it's someone who is supposed to be scary. There's so much detail put into every single spot and blemish on this dude's body. His mouth kind of reminds me of crayfish.
You get a good sense of how his horns are rocks. Well, maybe they aren't, but they certainly look hard. It's great to have a character who can be scary and cartoonish at the same time. I love this fire coming from his eyes. You know he's out to cause some commotion. Digital painting works great for you.