As much as I'd like to give you something, I think it will be better to wait until you get a better picture :( well, I'll give it a go anyway, although it could be wrong!
He seems to have good bone and sky-high withers, short canons and short pasterns, his back legs look a little funky to me- sickle hocked, I think?, correct me if I'm wrong, but I think I see a hunter's bump, he has a steep croup and a high-set tail. His shoulder looks rather straight to me, and his feet have no heels. He looks like he's probably limited in his movement from his shoulder. I don't quite know if he's a bit roach-backed or just really lacking a top line. I think his throat latch looks nice though, although this picture doesn't tell much lol. I'm not sure he's the best candidate for dressage, although I'm no expert. I guess this'll just have to tide you over until someone more knowledgeable comes along. :)
On the bright side, he reminds me of my old horse! Cute! I like his face, or what I can see of it lol!