It's not too bad, DL. I like the lightning and the concept. I also really like the background. A few things I don't like, though is the blurred spots on his face, and the emptiness of the whole thing.

A few suggestions? I think the sig should be a bit darker to match the 'theme' of the render. This can be accomplished beautifully using a purple and orange gradient map on soft light. And maybe you should darken up the corners a bit, like they are on your current sig. Then again, maybe it's just because I'm a fan of dark sigs. Either way, I think this sig has tremendous potential. If you want, I can show you what I did to make the effects stand out. PM me if you wish.