A muscle flickered in his cheek with the clenching of his jaw.

A muscle flickered in his left cheek, like distant lightning marking the end of a storm.

A muscle in his cheek flickered as he clenched his jaw.

Not a muscle of the Captain's face flickered.

A muscle flickered in the Factor's cheek.

A little muscle was flickering in his elegant Gallic cheek.

Though his expression gave nothing away a muscle flickered at the point of his jaw.

Not a muscle flickered in George's face.

Stilgar looked up at the night sky, and a muscle on his jaw flickered.

A muscle flickered slightly in his cheek.