My Predator Group

The predator in the top right is suppose to be the leader. He has long rings that look like tubes on his tube hair. I tried adding some scars on his face(The black lines), but I think they kinda blend in with his face.
I kinda messed up on the skull part, I didn't add that in until the last minute so its kinda off compared to the rest.
A different mask for the predator in the bottom right, and the pred alien in the top left. Thats my first attemp at one.