Make sure you are really working on those heels!! They are popping up a bit. Really sinking your weight in your heels will help a lot in itself. Next up, I'd pick up your reins a bit, and simply move your hands farther down the neck. Looking good!! :)
Remember to keep your heels down! They are the only thing that will keep you in the saddle if something goes wrong either before or after the jump. Also, try to release so you don't catch the horse in the mouth.
Also, try to release so you don't catch the horse in the mouth.
I just want to say to this comment, that there is a big loop in her rein, and a more then sufficient release for the size of jump she is going over. If she was to give much more release, she is going to start getting into the habit of ducking over her fences, instead of having a tidy smooth release.
OP--See how far forward over the saddle you are? Try and push your bum back a bit, so that you remain centered in your seat. I like that you have your hands pushed into the mane for a proper crest release. You do have a big loop in your rein, which in time, you should gradually get rid of, so that you can maintain the contact with your horses mouth.
Your leg has slid back a tiny bit, and your heels are just starting to come up. Were you pinching a bit with your knee maybe when you went over the fence?
You look like you need to anchor down into your heels instead of your hands. Your base support of your body still isn't quite what it should be. You need to move your push your heels down and almost forward which will rock your body back into alignment with your horse and into a good jumping base position. You also need to release as you go over a jump, in this picture though you seem to have a rather loose rein which is good if you are still learning a crest release. Your pony is adorable though!(: