The last two are (a little) high. I'd need to look at a different angle to see if your stance width / foot position is OK. If they are, we'd tell you to jam your knees out a little bit harder. On the way up, I prefer to have trainees think KEEP knees out. I find this helps convey the concept of stability that is needed in the knee in the bottom 1/3 of the squat.
These squats are, by the way, quite good. The first rep is pretty much textbook.
Things to improve: knee stability during the bottom third of the squat. FIX your knees in position and keep them there. You'll find that thinkig about keeping your knees still improves your hip drive. If you watch, you'll note that during the set the stability of your knees degrades as you get deeper into the set. On your last rep, you let your torso angle degrade a little too much. Concentrate on these things as you get deeper into your sets.