ah, fish-eye. fun lens
this somewhat depends on your own tastes, but i'd do a color correction on the head/face... a bit too red because of the darkness of the original. also, what is that 'glare' thing near the left eye? might remove that. i also agree with the sharpening, but you might get away with just blurring the background more to give the contrast of sharp vs blurred. it could also stand a bit more lightening in the foreground.
Craig