Cyrano de Bergnac, right?
Sorry, sorry, that was a low blow. Anyway, I think you do have to fix the nose- it's a bit mario-ish for a realistic character. Remember the nostrils, the wings of the nose, the bridge, et cetera.
As for the body- your main focus, I assume- you're close. The arms are almost perfect (or the guides are- I can't know how they're going to turn out in the end), except for the right forearm, which seems to bulge a little early and the wrist is a bit thick- unless I'm misreading the guides. As for the body, I think that you've got a pretty solid image going- just beef up the shoulders a ways to match the biceps. It seems like the left shoulder is being yanked back rather hard, without the shirt (or the shoulder beneath) moving to compensate- also, his left shoulder is quite slim in comparison to his right one. Do you have a reference for this one? If not, maybe you could find one.
That all said, at first glance this is a very solid piece- and that says a lot.
Anyway, good luck. (is there a reason his eyebrows are so faint?)