Yer it took ages to learn to keep my toes in doing flatwork. When we were jumping competitivly a couple of years ago I instinctivly released more over the higher jumps. We were only going over a small crosspole yesterday tho, why would you give a big crest release over such a small jump?? I was always taught to keep the contact.
Well you may pop them in the mouth when they go over it or land its just always something you should do when going over jumps at least that high not a huge release but just enough so you don't pop them.
-Your legs are in front of you. You should be able to draw a straight line through your hip and your heel. Bring your legs back so that your toe is on the girth
-It looks like you could leghten your stirrups. You don't need them that high for jumping those heights. This way you will sink further down into the center of the saddle
-When you release you need to move your hands up the neck. And close your fingers more so that you have total control of the reins.
Overall you have a very nice center of balance. And you seem to be able to feel the horses take off very well. You have a nice foundation and a natural back.
It is not just a horse,
It is the one thing that keeps me from being just a girl