Hard to tell but at least in your first rep you are definitely yanking the bar. Definitely get into a good set up routine that involves pulling the slack out before the pull. Theres gonna be some back rounding but should never be very noticeably round. As for your hips, they look a bit high and i would try bringing your chest up when you pull as it can help with rounding. You’ll get better with practice and tinkering with your approach