Hey Giorgos,
1- Pick a spot on the ground about 5' in front of you. Keep your eyes on it the WHOLE set. Your focal point changes on a few reps. Get out of the habit of looking in the mirror.
2- Lean over a little more at the start. You're too vertical on these.
3- Reach back with your hips more on the descent. This ties in with getting leaned over sooner.
4- Keep your chest pointed at the floor as you drive up.
*When you adjusted your gaze, your hips drove up a little better than when you were looking straight ahead. But you still need to get leaned over more.
Hope this helps!
-Aspiring SSC