I agree with tinyliny on everything she put! I might add, get those hands up! Looks like you're holding them in an awkward place, keep them a couple inches in front of the saddle horn.
You need work on your seat, you look is you're bouncing in the saddle more than you should be. Like Tiny said, stirrup less work would do you wonders!
If you want a critique on your horse's movement, post video of him in a roundpen or lunging!
Looks like a good horse for you, well behaved, pretty coloring! Good luck with him!