Nice natural light. I think with a tighter crop and perhaps a bit of rotation, you might be able to get a more dramatic image. As is, I think that this portrait would hold interest for the model and his friends and family, but not for many others.
Needs a better background. I don't like the blue cast on the face, but it seems like it may be from taking your own picture in front of a computer monitor. And it seems a little unsharp, like my self-portraits always turn out =)