This is a very well put together thoroughbred, and I could see him excelling in any English discipline. Particularly dressage.
He has a very gelding like head, but it is thickly tied into his neck.. Which may make it more difficult to flex at the poll. A beautiful neck though, pulling correctly into his shoulders. Which, are very sloped making for maximum freedom in the shoulders and a longer stride. This horse is a little uphill with tall withers but a decently straight back. All horses have such a variation in he haunch, and he seems to have a nice booty ;)
Now, as previously stated, his hind feet look very under neath of him, but that may just be how he is standing. I see very straight legs, and really nice, big feet for a thoroughbred. Although, his front pasterns are very upright and could cause slightly choppier stride.
Overall, this horse fits really nicely into a box and is equally divisible by thirds.
Very beautiful and well put together horse! Looks like he could do well in anything really, but the ultimate decision for his discipline would be based a lot on his personality, motivation, and temperament. Have fun with whatever you decide to do!!