For his confirmation (not that I'm any sort of expert) he struck me instantly as being built really downhill. I know that can be a quarter horse-y thing and I don't know if it would count against you in a halter class (totally clueless) but it stood out to me.
He's very good looking though and obviously well loved and cared for! I love the first picture!
He is too stretched out. It is up to you to make sure he is standing underneath himself with his front legs. Moving his front legs back by about 6" will make a whole different picture for a judge to evaluate.
Lose the gloves. Add some bling earrings, and perhaps a bright colored shirt under your jacket. There's just too much black going on. You need something that will give you some "pop".
The halter can be tightened up a couple holes. The noseband should be moved up to his jowels. Looks like you have a couple of inches of space to move the halter farther up on his face.