Simple?
You are too humble on yourself, this is actually a very detailed drawing! Sure, it doesn't have much in terms of background but still very nicely done. You really manage to capture the idea of a radio chat as the guy has an earpiece. I am guessing he is supposed to be a vampire of some sort? It's artwork like this that really makes me think you were inspired by Jhonen Vasquez. I loved the NG icons on his shirt.
He has the Agnry face and Dad from "Dad 'N Me" there. The eyes are great too because they're mostly yellow with those black streaks just crossing his eyes. His smile is a great one of malicious glee. That shoe he's wearing looks like a cowboy boot in the position it's on. I hope you keep on making great art pieces like this.