He looks a bit sway backed and has posty back legs. Other than that, I can't see anything. I do like how his neck ties in to his shoulder. Actually I really like his whole neck :) Posted via Mobile Device
I don't know much about proper Saddlebred conformation so I am going to judge him as if he were a stock horse.
Sway back, you already knew that, but it does look much better when he is moving out and his head is down. He is also very short backed (which isn't a bad thing IMHO). His shoulder is much straighter than I like to see, he might be a bit of a rough ride. His hocks are a little too straight and his croup appears to be fairly flat. His front legs look good from what I can see; nice short pasterns with a good angle and a good amount of bone on top of decent sized feet. His color is absolutely gorgeous and he appears to be a flashy mover.
I have a feeling that this little horse's topline will lift with correct work. Rather than being a true swayback caused by lordosis... this is based on the second photo where it looks like a normal back as he's lifted his belly a bit.
That said, he does appear to have a longish loin - which will certainly be a disadvantage when it comes to building back strength as a strong loin is critical in maintaining a strong back.
His shoulder slope maybe on the steep side, though not critically, it's countered by a nice open shoulder angle. He has a fairly large shoulder as well, with a nice length of humorous - this should all work together to make him able enough to reach forward, and still have some scope.
I like his neck... it looks like the Saddlebred has really worked to his advantage here... as did the QH when it came to his hip.
While he has a nice hip length, and pelvic angle for riding purposes... this is hindered a little by how straight he is behind - unless it's an optical illusion from the angle of the photo. He will be able to track up decently, but, if that side shot is "true" of how he stands, he will lack the thrusting and sitting power of a horse with more angulation - this will hinder any real ability to excel in dressage (beyond basics). His longish loin won't help his ability to "sit" either.
Overall, he's a very cute horse... He has pretty good overall balance, and he looks like a very kind and willing horse.