Great jumping position, but I agree that you are leaning a little low to your horse's neck. This caused your leg to slide back and your seat to slide forwards. Yes, it looks good and its what lot's of judges like to see, but it restricts your horse from jumping properly. And, might I say that your horses comfort is more important than a judge's opinion...
Anyways, try openning your hip angle a tad. You're not generally supposed to stick your butt out, but it helps to practice getting your weight over your heels. So when going over a jump, stick it out a bit so your rear is over the center of the saddle. Keep practicing until you've gotten into a habbit of jumping with your seat over the center of the saddle.
Also, turn your toe in a bit. Not very critical, but it looks better.
Anyways, sorry if I sounded harsh, because all in all you're a darn good jumper! :)
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