Sam, from this angle we can improve a few things. First off I’d like those to be about a 1/2″ lower. You’re at parallel now and we want you below parallel. Second thing, you are extending your back a little too much. I like the upper back arch but the lower back should be neutral will more ab tension, more rib down. Believe it or not if you move the same amount you moved on these squats with a neutral back you’ll likely be below parallel.