You are looking great! :)
There are just two things I have - one, I would give a bigger release.
Secondly, it looks like your heels ... I'm not exactly sure how to explain this ... but they flop. The turn out, then come in, then out, then in, in sync with your horse's stride. Almost like you just leave them very, very relaxed and loose. So they just flop on the horse. That sounds like a mean word, but I honestly can't think of how else to explain it! I'm sorry, I don't mean it like that :) I would just make sure you are really sinking those heels down, and keeping your toes forward.
When you are kicking, make sure you are using your leg, and not your heel. That could possibly be what it is. You will get a better effect, and it will look nicer, if you make sure you are kicking from your leg, not your feet.
Other than that, you look amazing!! Good job :)