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.
Thats all I can see.. someone could probably explain it better then me, lol.