Some really good comments have already been posted, but ill try to add some suggestions:
As others have said, your back does look like it rounds out a little at the bottom, and many factors could affect this: core region strength, foot placement (too wide/too narrow), letting weight go forward/in front of you,bar placement on traps etc etc. Just mess around with it all.
You could try messing around with your stance a little, or even putting 10lb plates under your heels might do the trick. (It helps some people, esp tall people).
Also try to control the weight more on the decent and get a small, very brief pause at the bottom to prevent "bouncing outta the hole." You could go a little lower as well, but that is also a personal preference to YOU. I go azz to grass, but parallel is perfectly sufficient to build good leg mass and strength.
I used to have the problem of my back rounding at the bottom of the rep and leaning forward back in the day, (I used to have tall-man syndrome) and I remedied the problem by putting on my warm-up set weight, and doing 3-4 second pause squats; whereas you squat down as far as possible and hold for 3-4 secs before exploding up. This increased my flexibility like crazy as well as the strength at the bottom of the rep. I have done these as a last set after my work-sets for a few years now, and I think is the main reason I can go ATG on every rep whether its warm-up or max.
But its not really a bad squat at all. You are going parallel, which is more than I can say for at least 99% of the people at my gym, lol.
Hope this helps bro.