For the first time Nick concentrated on the man's face.

She opened her eyes, and concentrated hard on his face to keep the swirling background at bay.

I quickly moved them up so I could concentrate on his face.

She would have preferred him to concentrate on her face, which was more presentable.

He realized the clone was still talking and made himself concentrate on her face.

I concentrate on your face and say something back to you.

It was too hard to concentrate on her face.

He concentrated on his father's face and the room he had been in.

I concentrated on the girl's face in my mind and let the notus point the way.

For some reason, her eyes tried to slide away from his body, and she had to concentrate on his face.