Great job on the coloring! The background's amazing as well! ^_^
Also, isn't that character from a Nippon Ichi game? o.o Looks like Laharl from Disgaea, except he's younger...I know there's a character in Phantom Brave (think that's the name) that looks like an older Laharl...
The lineart might not be yours but the coloring is stunning. It has a lot of depth.