When we got off the bridge, I pulled over and stopped, gave her my handkerchief. She fixed her face in the mirror, looked at me with a rictus of a smile.

His eyes, within this rictus-like expression, are very mobile and changeable

his face permanently clenched in a rictus of irritation

The yield curve forms half a rictus

Paul Ryan grinned his new grin, a crazy-looking rictus he had worn since the Republican National Convention

he is sure that he is not attractive enough for his surroundings, and thus 'sets' his face into an interesting rictus

Unforgettable, again, was the complicit rictus that Richard now laid at his feet.

his eyes frozen in a rictus of horror