I don't think his neck set is too low. It might be a touch lower than you would want normally, but I have seen much worse. Shoulder is upright, but the wither carries back decently considering shoulder angle, which might explain why he has the reach he does. Nice short, strong back. His hindquarters is a little short from point of hip to point of buttock, but not horribly so. Agree, tail set is pretty high, but I don't see that being too much of a problem. A little fine-boned, but not badly for his size. His left knee doesn't look as flat as it should be. Does he have an old injury there?