He was attracted by her smile.
- Il était attiré par son sourire.
Her smile expressed her thanks.
- Son sourire exprimait sa gratitude.
The man grinned widely and stood up. He then paid the bill and emptied his glass of beer in one gulp.
- L'homme fit un large sourire et se leva. Il paya alors l'addition et vida sa bière d'une seule gorgée.
That person has had an odd grin on his face for a while. What do you suppose is behind it?
- Cette personne a eu un étrange sourire sur la figure pendant un instant. Que pensez-vous que cela cache ?
She approached him with a smile on her face.
- Elle lui fit des avances, un sourire aux lèvres.
I saw a joyful smile on his face.
- Sur son visage, je vis un joyeux sourire.