You have a beautiful horse, and everything look pretty good in the first picture. It looks like your leg is your issue in the second jumping picture. Your toes are pointing out and your leg has slipped back in the second jumping pic. This makes you less stable, and can be dangerous. I think that is why you are so close to her neck in that picture. Not quite laying on her, but definitely not secure. Maybe you are less comfortable with that height? I would do a lot of 2point on the flat to build leg strength. I had problems with that and my trainer put me in 2point for an entire lesson. Ouch! But it works. With a stronger leg, your toes might improve.