Nice work, your supporting a lot of weight on your back there. Your arch looks pretty good, stance is looking alright, might bring it in a little.
Now to the meat of the matter, those are what I would call quarter squats, your close to paralell on a few of them, but you need to go at least below parallel if you want to get the most out of your squats. And if you want the most, you’ll go to rock bottom, but I’d be happy enough if you were going to slightly below parallel.
This chick’s got pretty good form: - YouTube
So my suggestion to you is lower the weight, get your squat lower, then gradually increase the weight while keeping your good depth.
The Squat RX series is EXCELLENT as well: