1. The bar looks too high on your back. Make sure you read/watch and apply the correct squat grip and upper back extension.
2. Before you unrack, get the middle of your feet under the bar, your hips back, and your chest down. Remember and apply the Master Cue at all times.
3. When you unrack, stand up and stop. Next, take one step back and stop. Next get tight and then squat.
4. Keep your gaze down. Aim your eyes and face at the line between the grey and orange mats and aim your chest down.
5. Break at the hips and knees at the same time while bending over. Your knees should be at or just in front of your toes by the time you're halfway down and they should stay there until you are halfway up. Your chest and face stay down until you're standing up at the end.
6. Get much tighter.
7. Keep your knees over your feet, they're knocked in a little on several reps.
You'd also benefit from weightlifting shoes.