He is gorgeous :) but honestly this picture is not that suitable for a critique. It is difficult to discern angles due to the fact the photograph has not been shot straight on and his neck is causing shadows. An excellent start, but next time take it parallel from his side.
He reminds me of my girl, Falicity!! She's a 6yo 3/4 Thoroughbred, 1/4 Dutch warmblood... also my H/J and eventing prospect :) she has a wider girth, though. Who's his sire? Piccy of my girl :)
He's a beautiful boy! He looks like he has good feet, clean legs and a lovely, strong-looking back. The only thing is that his back legs look a bit posty to me, but it could just be the angle of the camera. All in all, he looks like a fantastic hunter/jumper and eventing prospect!! Congrats! Like atomic said, though, it would be easier to critique if the picture was taken from the side, with the sun at YOUR back.