Wow, here's another really impressive picture! I think the best parts are the horns. I at least think this guy has horns? It's hard to tell if it's that or streaks of red coming out of the page. The fact that the eyes are so small makes it even scarier. My only complaint is a bit too much negative space.
I learned all about that stuff in art class. Of course, I could never make something as good as this. The teeth seemed to have gaps in them. You obviously have to look closely at this. It definitely looks like a guardian lord of Hell.