Not bad at all.
I would keep a little wider stance so that your lower body is automatically lower and gives you a stronger foundation.
Your non-dominant (right hand) is sort of flying away as you hit through. It shouldn't. It should be getting tucked in to prevent your body from opening up to quickly. Good way to fix is to catch the racket at the end of follow-through. Some pros - like Murray or Djokovic - don't appear to catch it, but their arms are not flying away like yours.
And, when you take the racket back, use your right hand sort of guide your racket back so you naturally get the shoulder turn.
Your left leg should never kick back as it did in one of the shots.
I would concentrate on hitting through the ball like people suggested and staying down low.