They look off balance to me. You want to be leaning into the court and hitting a recovery step after contact. The first thing that sticks out is your feet never move between balls. So if you ever play someone with a lot of experience, you are not going to be in position to hit the balls you want.
You need to get in the habit of always moving your feet between balls, even on a ball machine. What that will do is help you setup properly and get the balance fixed.
Please help TT Member BruceD get a wheelchair so he can play tennis again - http://tt.tennis-warehouse.com/showthread.php?t=496820