Not bad, clearly an improvement over the total screenshot/CnP icons you've been uploading so far.
First, i'd like to point out that his nose looks like it took a hard hit with a metal pipe. Redoing it might be a good idea.
Second, don't use smudge tool on the finished icon, since that erases all the detail you've put into it. I'd recommend smudge only for backgrounds, lights, fires etc.
As I said, not bad, but how about you try to draw something with no base, made from scratch? Some tutorials might help you.
4/5 for the improvement.