Its great to see the enthusiasm in you and your mount :)
The first thing I notice is a safety issue. The jumps you are going over have cups (pole holders) on the wings but no poles on them. This is dangerous for the rider and the horse. Always make sure the fence has the cups (pole holders) taken off the wings or has poles on them. Also always make sure the cups are not left on the ground as if a horse stands on one it us usually a long time off lame.
I would work on two things to help you. The first is to try and get you to keep your leg underneath your hip when jumping. In the pictures you are going too far forward, but this could also be because your lower leg is swinging backwards, not necessarily that you are launching yourself too far forward. Try and stick your lower leg (from the knee down), to the horses side.
The second thing I would work on is keeping a straight line from your elbow to the bit, including the jumping phase. This ensures that you have a contact with your horses mouth continuously throughout the movement.Your trainer might prefer the 'crest release', so you will really have to go with what they say for now. Then when you are proficient you can make up your own mind.
The main thing is to enjoy it, and you sure look like you are doing that,well done!
What I know about horses would fill a book, and what I don't know would fill a library..............