You and your horse make a nice pair! He is a really cute jumper who looks through the bridle really nicely.
I would shorten your stirrups a big hole, as stated before. This will help with your slightly lose lower leg and keep you more with his motion. If you get in a bad spot, you could really get left behind.
Twist your stirrup so that the outside brach lies diagonally in front of the inside branch. Thin will help you gain more flexibility in your ankle, which releases any tension in your leg.
I think you have a very nice, following hand that is offering you much support. It is so nice to see a rider who is not using a mannered, floating release that has no function whatsoever. Once you shorten your stirrups and get your base more stable, I think you could use an automatic release. I think your horse would really enjoy it, and he will be able to show his best form.
You two are a very nice pair with lovely turnout! Are you an eventer? You have what appears to be an armband.
You look like you jumped ahead of him just a tad and it put you too far down on his neck. See if you can pull your shoulders back a bit and it will help lift your upper body. Let him jump up to meet you so you don't overjump. But it still looked pretty good!