I see a horse at the walk who is hesitant to walk out, due to him knowing exactly where the boundaries of that device are, and your seat being a bit stiff. I bet he is capable of so much more walk.
At the trot you are balanced side to side quite well, have a reasonabley quiet leg, but your hands are "bouncing" on the rein, and thus on his mouth. Probably due to a stiff elbow.
At Canter, again, I see the horse in a markedly cautious way of moving due to him not wanting to hit the boundary of the tie down.
CAn you ride out in the open? Can you ride without the comfort of the rail?
When you can walk and trot and canter without the rail or the arena, then you get into "good rider" territory. You do certainly have a very good start.