A real nice shot, and I agree with Augusto. I'm just now learning my way around in PC, so I'm certainly no expert. Here is what I came up with. I have tons of older photos I'm trying to improve using PC with some success. Hope this helps some.
i like the expression and emotive look on this portrait, but it is really need to be sharper and maybe a little play with light would be useful, if it impossible in real shot, maybe some PS use,...and the border is a bit out of taste....... i feel, that there was some other reason to add this photo in here ;)