I don't have much to add to what has already been said - but I agree w others you are doing quite well. I don't ride English, however, the position of your feet periodically throughout the videos appear to far "behind you" for lack of a better description and, as has already been mentioned - your toe position. In an effort to describe what I mean better, it would seem that if the horse stopped short your leg position in those instances would potentially throw you forward.
Oh...and welcome to the forum! Beautiful horse, btw.