I agree on the slightly too straight hocks. Ideally I'd like a longer neck, cleaner throatlatch, and a little more angle on the shoulder. Could just be the picture angles, but he may toe out just a touch? That said, he's a very attractive horse who is fairly balanced with a gorgeous hip and a kind eye to bring the whole package together. Looks to be in good flesh with just the right amount of muscle tone. I would expect him to place in mid level Halter shows, and probably clean up at lower level open shows.
Lucky you to have the opportunity to work with such an adorable and willing horse! He's one I'd definitely want to take a look at.