You look great! As posted before, you don't need such a big release for the size of the jumps they are. Sit up a tad bit more as some pictures you are to close to your horses neck and you are almost "ducking".
Personally, I love where your stirrups are, shows that you don't need your heel to anchor you(but still have your heel in a nice position), I don't like seeing such a over "exaggeration" of your heel being so far down, it becomes very tough on your ankles as you get older, you look to actually use your whole leg and your seat. Keep up the awesome job!
Also: I think if you were to higher your stirrups you would be hiked up, you have a very long leg!