Kinda what the others have already said.
Keep your heels down consistently.
Lengthen your stirrups a tad, so that you can bring your heel backward a bit. You are a little "chair seated", meaning your heels, hips, and ear are NOT in a straight line like they should be.
When you cue your horse with your legs, it should not be so much of using your heels. You should instead use calf pressure. This will help keep your heels down, if you are not moving them around to cue the horse. This also keeps your toes from pointing outward (which they should not do) and keep your feet parralel to your horse.
Yes, I do like how quiet your kept your hands, and in good position too.
Now, I would say a bit opposite of everyone. Yes, I can see that you look relaxed in your riding, yet at the same time you kind of look tense. Maybe just thinking hard? Something just gives me a "stiff" or "tense" feeling about things. I do very much love what your instructor said: "Ride like you are in the Olympics." And that is very true! Keep your head up, and thinking proud.
Overall, not bad!!
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.