I like the way you smile.
- J'aime ta façon de sourire.
He hides his sorrow behind a smile.
- Il cache sa tristesse derrière un sourire.
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.
She looked at him with a smile on her face.
- Elle le regarda, le sourire aux lèvres.