Here's a good example of what a hunter over fences should look like.
Note the overall feeling of relaxation, like the horse is just loafing along, the release halfway up the neck, and that the contact is also soft, with a little bit of float to the reins. Also note the round back of the horse, and the position of the head and neck. His knees aren't bad either!
Here's another, not the very floaty release, and the way the horse "drapes" over the fence -
On the other hand the horses are doing a lovely job of the jump
I liked your position except in one I felt you were too low to the horses neck.