And now there's a submitted piece into the gallery!... : )
Is there really a need for the white background?
I like it :) Try to make the lips better by making them a bit smaller maybe, as they seem v. large at the moment. His hairline also seems too far up his forehead, but that might just be me... I've changed my mind, it doesnt XD but the shading on his forehead seems to be a liitle to contrasting...
It seems you have a different lightsource on the forehead and on the glasses. The shading is altogether too mirrored imo.