A few small tidbits, but I don't see anything really bad at all
.:Jumping:.
My first point is to release more. Yes, I know you are already aware of this, but I will list a few excersises to aid you in your release.
A lot of times the reason people don't release as much as they should is because they are using the neck for balance. I do believe this is the case here. I believe this, not just because of the release, but also it seems you are having a difficult time coming back into the saddle after the jump. I would work on your core.
To do this, I would do a few things, mounted and unmounted. Mounted - try jumping with no hands! Once you get to the jump, spread your arms like a bird! Still get into your two-point, but don't use your hands. This will help strengthen your core, and I think it's really fun too
I would also do an unmounted workout. 100 situps a day. Sounds like a lot, but it goes by quickly. 50 in the morning, 50 at night, 100 at night, a few throughout the day, however you want to do it is fine, but I would try to get them all in. Being physically fit will help your riding tremendously.
I also see just a few other things. One would be that your leg is sliding back.
Make sure you are hugging your horse with your legs the entire ride. Heels down, toes up for security, and lock in your leg. If you can, grip with your thighs and your calves (NOT your knees!) but if you can't, it will come later in riding as you advance.
.:Flatwork:.
You are leaning forward WAY too much. No dodging around it, so I have to be blunt. You are leaning forward, which is throwing your balance, causing you to bounce in the saddle, and be more insecure. Act like someone is pulling your head up by a string. Roll your shoulders back, stick your boobs out, and act like you are the prissiest little rider EVA! It sounds dumb, but it does work.
You almost seem to be slouching. Make sure you are sitting up very straight and pretty. Pretend like you are at a show 24/7. Don't slack off in lessons. I only say that because I used to do it too
You advance so much faster if you are at your best all the time.
And lastly,, don't forget to bend your elbows
You really are a nice rider, and you will shape up to be someone to really watch out for! Yes, you've got some things to work on, but if you didn't, that wouldn't be as much fun, now would it