Opinions on my horse and my equitation?

Your upper body and hands are good, but try to work on getting your lower leg underneath you more, it needs to be right at the girth. This usually occurs when you pinch with your knee instead of using your thighs. Lots of jumping with no stirrups will help and even posting to the trot without them will encourage your leg to sit correctly because you have to use your thighs. Good luck!