Just to add a couple things:
- keep your hands off the horse's neck
- make sure you sit straight, don't lean your ribcage or drop a shoulder, like in the 6th picture
- your legs have slipped a little forwards in some of the pictures, try and keep a nice line from shoulder-hip-ankle
As said before, the picture angles are a little hard to critique.
Overall you look like a nice rider, keep up the good work :)