Viewing this on my phone so I can't really say if I can see everything, but here's my take
From the angle you have the phone it looks like you're doing most everything correct. No real rounding of the lower back, and you're going to good depth.
I would suggest pushing your knees out even harder during the squat (not changing your stance, that looks fine). And I would suggest two cues for your upper body--
1) think of an imaginary arrow point directly out of your breastbone. Now try to point that arrow at the ceiling--and keep it pointing directly at the ceiling throughout your squat, especially in the hole.
2) to help with that, think of keeping your elbows higher, forcing them up throughout the movement.
So, point your chest at the ceiling and push your knees out more all throughout the motion, but especially in the hole.
I can't see the deadlift video.