His legs do look quite upright, but changing his hoof angles will certainly help a little.
I really like his whole topline. It could still have a little more muscle, but his neck is higher set, and blends into his withers very nicely.
Build up his hind end a little more, and he'll look fab.
Honestly, his conformation is quite correct, except for the uprightness. I really like him.
I definitely do see the grand-sire resemblence. Nice looking thoroughbred.