The older woman's face had set into a white mask.

I kept getting salt water into my mask and it was hard to clear.

He was pale, his face frozen into a mask of itself.

Despair had turned his features into a mask of pain.

Then his face twisted into a mask of terror as the truth hit him.

He looked around him and saw that some of the faces were set into grim masks.

Then she composed her face into a smiling mask and turned to listen.

For a moment, her beautiful face twisted into a harsh, cold mask.

At first her face showed relief, and then it turned again into a mask of hatred.

The white, black, red face was surprised, just for a moment, then it settled into a closed mask.