It could be just the movement or the way he's standing, does he typically stand with his hind legs so far under him?
He's very well put together my only complaints are how far under his hind legs are and that he has pretty long pasterns. Pretty high withers and not much build on his topline. Put some muscle on him and I could see him doing anything really.
Personally if he were mine I'd teach him unmounted agility xD Just cause it's tons of fun! But he could excel in light-medium dressage, jumper, western pleasure, anything really. With those delicate legs I'd be careful pushing him into seriously high levels - but I say that for every horse.
I like that he's fairly short coupled, but that may be an illusion xD Nice long neck makes me think western sorts of stuff.
You've got a lovely boy there :)