I love your horse, first off, and I love you before and after the jump, nice and controlled and very tidy. However, I think you do have some issues with your jumping position. Not big ones, mind you, just some things you can watch out for to make a good ride an even better one. First off, your hands are too far down in your lap over the fence. I think this is making you catch your horse in the mouth after the fence. Bring them up and forward, like this. (this is a random picture, not me) http://i232.photobucket.com/albums/e...9de0d21b52.jpg
Mind you, don't lean over as far as this person is, your jump is smaller.
Also, as you said, your leg is not beneath you. Shift your center of gravity forward.
You've got the inbetween the fences stuff down nicely, from what I can see, just work on those position issues and you're golden. The inbetween stuff is what really counts, anyway.
On an unrelated note, what breed is your horse? :) I'm fond of appaloosas