This is not the most useful angle -- can't see most of your back. I think it's slightly rounded though (upper and lower).
General thoughts: think about pulling chest open, stay tight, stick your butt back more on the way down, drive those knees out (I think they're caving in a bit, as you let your knees slide forward at the bottom).
Depth is a tad high, or borderline, on some of these reps.