Try to hold the reins in your palms with your thumbs up.
It looks a bit like you're beginning the "puppy paw" hands.
You're also holding the reins inbetween your fingers, which prevents you from having a nice, solid grip.
Stirrups on the balls of your feet, keep your leg back, and by the looks of it, when you do your posting, you're going straight up. When posting, don't go straight up, but rather push your belly button out forward slightly as if you were in two point, but not leaning as far over the neck. You have good hands and you're doing an amazing job of looking forward. Make sure not to punch the saddle with your knees, relax the knee off the saddle so it helps you to keep that lower leg back. Just make sure you remember these basics in posting:
-Heels down toes up
-Lower leg wrapped around the horse's belly
-Look forward between the horse's ears at all times.
- Leg back
-Don't lean all of your weight in the hands
-don't go straight up, but rather slightly forward.
Hope this helped and keep up the good work! Posted via Mobile Device
I agree with the comments above. Please consider adjusting your running martingale correctly. It is about four inches too short. The rings should reach the throat of your horse. Yes, that is long, but the running is not meant to hold a horse's head down, just keep it from flipping it way up. I am also not a fan of putting a running on a bit ring that has a gag effect. I would put it on a seperate rein on the snaffle only. If you need the leverage of a lower ring, I would add a second rein. As short as the martingale is, the horse will hit the gag effect constantly. Just my opinion.....