It looks like you may be trying to force weight into your heel, which is causing you to push your leg forward. Instead of thinking "heels down" think "toes up and forward". Your toes should point more forward than outward so you can use your calf muscles correctly. The jumping pictures aren't very clear, but it looks like your wrists might be broken (pushing in to his neck rather than keeping them straight.) In the first o/f photo you are "balancing" with a pinched knee and on your horse's neck with your hands. Also your horse is very uneven in the front end over fences. Work on gymnastics to help that. You should work on flat work more than jumping in general. The better your flat, the better your jumping!
Basically, thumbs up, toes up, eyes up, and practice gymnastics!