In this picture - you are jumping ahead, allot.
Lets break it down......
You are riding the fence, and not your horse. See how much space is between your seat and your saddle - that implies a rider who is jumping the fence for their horse, instead of allowing their horse to do their job.
So lets ask why you are juming ahead -
Lower leg security. Although your leg is at the girth, which is great :) You are riding on the back of your calf and you are gripping for a base of security.
Work on rolling your toes forward, and allowing your inner calf to make contact with the girth. Open your knees up, and allow your bodies weight to flow down into your heels.
Now - you are anticipating the fence. You rode the fence, not your horse. What does that mean?
You are staring at the fence on approach, instead of picking a focal point beyond the fence. You raced to the fence, instead of allowing it to come to you, and you forgot the most important factor...your horse, who is under you.
You know the fence is there, your horse definately knows that fence is there...so why are you staring at it? Look up, look beyond.
Learn to ride your horses rhythm. Focus on his pace, whether it be a trot or a canter. Focus on his rhythm. Remember to get your legs to the girth, opened knees, weight distriubuted where it should be. Sit, sit, sit, sit and allow your horse to do her job.
Your job is to get her to the base in a safe, quiet, rhytmical flow. Her job, is to take off and land.
Allow your horse to lift you out of your tack. Not you lurching out and forward - but sitting and waiting. Remain over your horses center of gravity, and stay out of her way. Close your knees, push your toosh back and push those ta-ta's out. There should be only just a bit of space between your seat and your tack, and your seat should be over the center of your saddle. Close your knees - sink into your heels.
Your back is nice and strait, and I like that you are looking up. I like that you are not interfearing with your horses mouth either.
By you lurching yourself ahead like that - you've now tossed all your bodies weight onto your horses forehand. You have then, made her job, that much harder.
You want to aid your horse, support your horse, bring out the best in your horse. :) :) :)
This fence - It appears you got left behind. I'd wrather see a rider left behind than lurching ahead.
I don't see knee pinching either - but hard to tell at this angle. I do see a weak lower leg though, and I do see a rider who is not allowing her heels to do her job - which is anchoring her into her tack.
Really work on riding with your legs locked at that girth. You are not ontop of your horse, but you want to be wrapped around your horse.
Allow your leg muscles to be trained as to where they need to be - the reason why we want our legs at the girth and wrapped around - is to aid and support our horses to, over, and after the fence.
If I, for a moment, take my legs off that girth on approach....my horse stops dead in his tracks. He says "Where did you go?"
He needs that support, and I learn the hard way *jump cup embedded in arm* and quickly taught myself to keep those legs at the girth and wrap them around.
Knee's opened, inner calf at girth, heels deep taking all my bodies weight.
Your seat is lower and centered - but I think you got left behind your horses motion.
I love your hip angle and that you allowed your horse to come up to you. Remember, it is our horses to lift us out of our tack, and it is our horses who close the angle. I like that you did not collapse your upper body onto your horses neck - where instead you allowed her to come up to you.
I like that you are looking up, and I love that your arms are to your side *I have chicken arms*