The only thing I see is that your toes are sticking WAY out, I don't know if you're trying to get him to move forward, but keep your toes in a think about squeezing with your calves/legs instead of with your heel to get him to move forward. And you're leaning forward too much, try scooting more to the front of your saddle... it looks like you're too far back.
Gorgeous horse! :]
You're leaning too far forward. You need to rock back off you're pelvic bones, pushing the horse forward.
You're heel needs to drop back, underneath of you're self. That will come with strengthening you're lower leg.
Also your toe is pointing our, this could mean that you're sqeezing with you're knees.
Its hard to tell, but I think you might have you're elboys too far too the outside. Try to relax, just take a deep breath and bring them back.
That's all I can see.. someone could probably explain it better then me, lol.
He's got pretty nice extention, I can't see anything that really bugs me, other than that he has a tie-down. Why does he need a tie-down? Does he toss his head? Is he prone to lifting over the bit? He has very nice head carrige and I can see that it's hanging loose, so I'm just wondering why he needs it, perhaps for cantering?