When she turns from the window, her face has a hard expression.

His cold, hard expression cut me deeply, but I should have been prepared for it.

She glanced into the stony, hard expression and knew he didn't care.

Perhaps that was why she had such a hard expression.

His face flushed and then set in a hard expression.

He was looking toward the head of the corridor, a hard, intense expression on his face.

The pretty face wore a rather hard but, she decided, very capable expression.

And I could see from the hard expressions set on their faces that they had not come to welcome everyone back.

She'd never seen the hard expression now set on his face.

There was a tense, hard expression on his rugged face.