Your position is lovely over many of the jumps, especially considering how your horse is taking them. Like many horses on their first cross-country runs, he's ducking his head pretty far down over the fences and overjumping several of them. This can be disconcerting for the rider, but you're handling it beautifully.
You jump up on him a little bit over the rool-top coop (#12, not #6), with your toe sliding down and your heel creeping up. It's actually better to get left behind a bit than to jump up over the pommel, so really concentrate on keeping your seat bones centered over the seat of the saddle.
And finally, in #8, I'd like to see more crest release, but he looks excited and you might have been checking him before the landing. So hard to make judgments without context.
Overall, though, these are nitpicky criticisms. Don't know why anyone would be disgusted.