Its actually not bad as such.
The deadlift looks fine. I'm not a fan of dropping them personally but outside of a competition there's no law against it. At the start try pointing the base of your ribcage down at the floor - that'll get a batter arch in your back. Also try pulling the bar into yourself and getting your shoulders more behind the bar, but honestly those are just niceties that'll improve a pull that is better than many I've seen. If you're going 120 kg for reps, I'd recommend finding out your max and working more in the 1-5 rep range. Just make sure your technique stays broadly the same as you pull heavier. If you can't maintain decent technique, the weight is too heavy. Good pointers for technique breakdown are: lower back rounds, shoulders come in front of the bar, hips shoot up too fast.
The squat needs a bit of work, but it also isn't terrible. Overall, get tighter: make sure your upper back, midsection and glutes are locked in before you go down. What's worked for me has been:
- drive your head back into the bar
- pull the bar down into your back and pull it apart
- pull your elbows under the bar
- breathe into your lower back and squeeze down on that air
- squeeze your glutes hard
- you are now ready to squat: drop your butt down and push your knees out.
Coming up, lead with your chest and keep it up, keep driving your head into the bar and pulling the bar into your back and your elbows forward while you push your knees apart.
You do have buttwink, but it isn't shocking.
Power clean I can't help much with I'm afraid. It doesn't look terrible though I don't think.