I'm assuming all of the pictures on your Flikr photosteam are of you (I'm not great at crit. based on videos.) so if they're not, then obviously ignore what I'm saying, hah.
It looks like you're jumping ahead. You can really see this in this picture (gavin, flower and bird paintings 193 | Flickr - Photo Sharing!
) Your crotch should be behind the pommel of the saddle. You're also laying on his neck a bit, so you could try sitting up a tad. (I know the laying on your horse's neck is a huge thing right now, especially in the hunter/jumper world. It always drives me crazy for some reason though.)
The other thing that really stood out to me, is your release. You definitely aren't bumping your horse in the mouth, which is fantastic, but I think you could work on an automatic release. I have a thread on here about working on automatic releases, and I got some really great advice, so if you want to read through it I can get the link for you. Anyways, if you slide your hands down a few inches on your horses neck, you'll still be giving him all the freedom he needs to jump but it'll look much cleaner.
You could also sink the weight down into your heels a little more, which might help you stay off your horse's neck. Overall, you look like a great rider. And your horse is beautiful