You could really need to have a light from the back to separate the hair from the background and to create a more dynamic lighting. And I'd tone down the saturation to like 50-60%! Good luck with further editing.
I like the shot. But to me his expression doesnt seem believable. I am assuming you were going for a look that says he just survived a week in the woods, or something like that. But to me his look says he just rubbed some dirt on his face and posed for a picutre. IMO