Very nice looking horse. I have no idea what his breed would be though. He looks quite well put together. The only thing I see is that his back is quite long and looks a bit hollow. But, a lot of people are attracted to that, so I don't see any major conformation defects.
He has got a good posture but in the second photo where he is trotting, it seems like his head is a bit droopy. But, when I really think about it, I'm just being fussy! He is very good! I kinda don't think he is drooping his head. Nah, he isn't!