You have allowed your heel to "go light" causing it to go up. This has allowed the stirrup to slip back past the foot's arch. As a result, you are unable to sink any weight into your ankles/heels. This tends to unbalance your upper baby badly. Even with this, your upper body is not that bad.
You need to keep the stirrup on the balls of your feet and sink down into your relaxed ankles. This will help keep your heels down which will help counterbalance your upper body.
Overall, you don't look that bad here. Again, the stirrup has
slipped too far back on your foot. keep it on the balls of your feet and keep those heels down. With the heels down, the stirrup can't slip back.
You are pointing your toes down (not up) and the stirrup is unable to help you keep your balance because your heels can't go down. It looks like you are unbalanced and had to plant your right hand on the pony's neck to balance yourself. You biggest problem is, again, stirrup placement and stiff, inflexible ankles.
You are grabbing with your knees. When you do that, it makes it very difficult to "wrap" your leg around the horse's barrel. This
will let your lower leg slip too far back. That, complicated by the stirrup too far back on your foot, has unbalanced your upper body (which is in a pretty good position, considering).
If your stirrup was under the balls of your foot, you could sink down into your heels which would help balance your upper body. If you relaxed your grip with the knees, you could wrap
your legs around the horse and maintain more contact with the inside of your calf. This would help your lower leg stay further forward, at the girth, where it belongs.
The same observation. As a result of your lower leg going back and your heel going up, you are totally relying on the crest release to prop up your upper body.
Hmmmmmm.....Things are looking better here! You have the stirrup farther forward on your foot. While your heels need to be further down, they are not as light as they were in the other photos.I always tell my students to "land on their feet" coming
off fences, which is mostly what you are doing (you are landing a bit too much on your knees, too). Your lower leg could be a smidge forward, but not enough to force your seat any further back. Your upper body may be coming back a bit too soon. I worry that by going back so soon you may accidentally snatch the horse in the mouth. I would like to see you a little more off the saddle and a bit more forward. It looks like you may be dropping too hard into the saddle too soon, but that may not be the case.
Overall, this one looks much better.
You've pivoted on your tight/tense knees allowing your lower leg to slip back. This has caused your upper body to topple forward making you prop it up on your hands.
These are all VERY common problems that all riders battle. Even now I sometimes do some of these faults when I get sloppy. These are a few exercises that may help
To teach you to relax your knees and keep your lower leg forward, as you bring your upper body forward into your jumping position, push your lower leg forward until you can hold your position without putting your hands on the horse's neck at all. Arms out like airplane wings. the further forward your lower
leg is, the easier this will be. You will feel the back of your leg stretch and burn....GOOD!!
The whole time you are doing this, relax your ankles and allow your weight to sink into them. This will lower your heels.
Hold this position until it is comfortable standing still. Then do it at the walk until it is comfortable....then the trot....then the
You have a natural position with your upper body. Now, just get your legs under you and you will see a huge difference. Hope this helps you!
BTW, your pony looks like a small version of my horse. We
could do mismatched pairs class!! That would be too cute!