You look like you have a very good foundation, your leg looks very nice. I would like to see your hands a bit higher so they are not so in your horses mane, thumbs up (no "piano hands")! Sit up a bit taller, my coach used to tell me "pretend like there is a hot air balloon attached to your helmet and it's lifting you up!". Last thing, have a closer contact with your saddle, this is just my opinion but I don't like seeing riders "hovering" in the saddle, I've seen so many of them go a** over tea kettle lol.
Keep up the great work, you look like you are very talented for your age!