This is a very difficult image to critique; that is: It could be meant as a specialty advertising image, in which case it might be perfect, or it could be just a happy snap, in which case it's a nice keepsake image. In general a couple of things strike me: One is that the highlights on his skin look a bit too hot, he has serious racoon eyes, and he's pretty much perfectly centered in the frame. Consider adding a bit of fill, either flash or reflected to bring light & life into the eyes as well as to knock down the highlights a little, and also move your subject at least a bit off to one side or the other as centered subjects tend to have less visual appeal than non-centered ones.