First Picture: You got to a good distance but your horse didn't plant his hind feet as well as he could have. Nevertheless, he is jumping with his knees dead even and up high enough. He isn't jumping super round or super flat. Your heels are lovely, as is is your posture. You didn't jump abead or get left behind. You broke over a little too close to the neck instead of showing body control but overall, awesome job!
Second Picture: Not quite as good. Your horse is better on his hind end but his knees aren't even, he's "mid-air cantering" with his front legs. I think a ground line in front of the jump rather than behind it would help. Your heel is just level rather than down and your seat is too high off the saddle. Sink down into your heels and let your knee bend a little more. You have less release but you're not pulling on the mouth, you know what your horse needs but he might jump rounder with more release.
Third Picture: I understand that it's old but I'll critique what I see. Your horse is trailing behind and needs more leg aid and engagement. Your heels are down, but not as far as they could be. Try to bring your leg back an inch or so and push down into your heels. Your seat looks quite nice, as does your posture. Your elbows don't have quite enough bend in them. Lift your hands just a little so you have a straight line from elbow to bit.
Fourth Picture: Your horse, rather than tucking his legs in, just overjumped. Overjumping isn't a bad thing but it isn't ideal to have his hooves out in front of the knees, it's just a little too loose. Your heel isn't down, try to sink into your heels and bring your seat closer to the saddle. Your posture is nice but you jumped up the neck a bit. Your shoulders are quite stiff, bring them back and relax. It looks like you need to shorten your reins on the approach because your hands are just above the withers but your reins are swinging in the wind haha. Too much release is better than not enough though.
You have improved a lot in the last year, you look great in the latest ones!