You have a very cute horse here. But there are some things you need to fix. It looks as if you are gripping with your knees, and this is causing your legs to swing back. You need way way way more heel, your toes are pointing almost directly down. You have a beautiful two point other than your leg though. You might want to come back down in the saddle just a tad, but I think with a more secure leg you will automatically come back a little. Your release is messy. You have a very tight hold on your horse's face. There is no need for the death grip. Lengthen your reins some, and bring your hands back down his neck. If you are worried about still being able to have your horse in your hands when you land, you don't need a short rein to do so. Even though your head is cut off, I can still see your chin an dit looks like you are looking up. Good job there. You look like a very nice rider, just fix your leg and your release. No stirrup work will cure your leg. Lots and lots of no stirrup work. If its painful, good, that means you are doing it right. Your release on the other hand, is something you have to play around with. Learn the different type of releases and find out which one suits you and your horse best.