Widen your stance a bit (you want it shoulder width). When you take your breath each rep try and keep the ribs down (bear down on your abs) so your back is flatter. Then lean over more at your hips as you start to go down and shove your knees out hard. Your wrists are very bent and elbows a bit high at times, so it looks like you have some shoulder tightness. Keep an eye on this (and try to improve it) as you will often get upper back rounding with this type of setup, particularly near the bottom of reps. You can see a bit of it here in these reps.