I think your leg needs a lot of work. You have our toe almost perpendicular to the horse, which really changes your support. In the last two pictures, particularly the last one, your knee isn't even in contact with the saddle. You need to distribute your weight evenly across your thighs, calves, and ankles. In other words, your leg needs to still be pressed against the saddle. When your toe goes out like this, it forces your knee out too. I attatched a picture of me riding about 3 years ago. I used to do the same thing as you with your toe. Notice how my knee is no where near the saddle. Maybe if you see someone else doing this at a different angle, it will help clear things up...
Now the good things!! Your release is quite good. In the first pony picture you look like you're laying on her neck a bit, however in the second picture you look much better. Also, in the second picture with you on your trainer's horse, you look quite nice. Your leg looks better in this one. The one thing I will say is you jump ahead. That's a difficult habit to break. (I do that as well!) What I've been doing is working on little 18in cross rails, and coming in at a nice slow canter. I try to get into 2point about a stride out and seeing if I can just hold that position over the whole jump. Obviously, this is a very basic way to jump, but I find it helps jumping bigger if you can get small jumps perfect.
Anyway, you look like a nice rider, you just need to work on your position a bit. Good luck! :)
Worth The Wait <3