Your horse is very lovely... she appears to be heavy on the forehand, though.
As for you, the most glaring thing is your seat.. you seem to be too far back in your saddle, and are "perched". Is your saddle too big? It is hard to tell. You should scoot your butt up/forward a bit, and relax your back. (You are arching your back)
I would also like to see you shorten your reins, so your hand is more in front of the saddle. I think you could shorten your stirrups a little, also, so you sink down in your heel some more.