I do not see "heading horse" for roping in this horse's future. I like him, but a heading horse needs to be a LOT of horse.. with good bone and the ability to take the jerk. Most Thoroughbreds have neither the bone or the disposition for that sort of work. He MIGHT do barrels because he is not big, but be sure to use support wraps on those legs. Thoroughbred legs can take a lot (many are jumpers) but it is mostly straight compression, not the twisting and stiff stopping needed for Western sports (there is a real good reason Quarterhorses dominate these sports).
This horse is actually quite nice. He has a good shoulder, nice open angle at the point of shoulder and he is nt tied in behind the knee. I would like his nice, roomy hocks to be a bit lower to the ground. He has very long rear pasterns.. fronts are typical for the breed.
His coupling is a bit weak and the top of his croup is set a bit far back (that is why the coupling is a bit weak). He has nice withers that carry nicely into his back. His neck seems a bit ewed, but considering its location above his chest, it seems this is a lack of groceries, which you are providing.
This is a nice little horse. I don't much like his head of the set of his jaw.. it seems weak. That being said, you don't ride the head!
I could see him being a nice little equitation over fences type horse. He might jump nice and flat enough to not jar his rider. However, he looks to have the potential to be very round over fences which would make him a nice jumper but not so good an equitation horse.