A momentary trace of bewilderment crossed the old man's face.

A trace of annoyance crossed his face, then he forced himself to smile.

A trace of a smile crossed him, and he turned away.

The trace of a smile crossed the pudgy mage's face.

A trace of a smile crossed Billy's face, but he didn't look up.

A trace of a smile might have crossed Trevor's face.

The slightest trace of a smile crossed his lips.

A trace of another frown crosses her brow before she speaks.

Again, a trace of a smile crossed the woman's lips.

The trace of a smile crossed his face.