He has an upside down heart on his flank!! how cute!
He looks like a sweet guy, but definitely has conformation issues. He's only three, so I'll forgive how bum high he is, but he looks like he will probably still be built down hill once he's mature. His neck ties in pretty low too. Croup slopes at a steep angle, and his back looks look... splay hocked? I think that's the term. It looks like his hind hooves point outwards. Then his front hooves look pidgeon toed. Could be how he's standing or he could have crooked legs.
Try to get better pictures! Judging from this one he is very very far from perfect.