I was comparing him to the APA Standard of Perfection for the Black Jersey Giant.  Here are a few things to look for:
He should be around 13 lbs.  His comb should have 6 well-defined and evenly serrated points (couldn't really tell from the pics).  His plumage should be greenish black with no white feathers.  From what I can see he carries his tail around the 45 degree angle, and his sickle feathers look good.   Since he is crowing and standing tall, I can't tell but his back should be long, broad and nearly horizontal with a short sweep to his tail.
There are a lot of requirements in order to be judged by the Standard of Perfection.
I am no expert, (my son is just getting into showing chickens for 4-H) but I think he is very handsome, too.  I think it would be a great experience for your son to show him at the fair, even if he doesn't win 1st place.  (I'm thinking about the marks/scars on his comb).  I say go for it!  Your son will have a lot of fun.