I'm not a professional, but...
The first thing I notice is that you are putting too much weight into your release. You are also jumping ahead of your horse, so that your bum is in front of the saddle. It all looks pretty insecure to me, because if you were in that position and the pony's head went down for any reason or if you had a refusal, you might come off over his head.
You should take the weight off your release so that you are not leaning on the pony's neck, and put that weight into your heel where you can be more secure.
You should also try getting your bum back so that it's over the saddle, not in front of the saddle.
Hope this helps and good luck!