Satrapi and Paronnaud have rendered the grandmother so richly, and Darrieux inhabits her so vividly, that by the close of the film, a small, simple smile on her hand - drawn face speaks volumes. (notcoming.com)
In theory, this is a comedy, although the lack of guffaws, chuckles, or even simple smiles tells a completely different story. (markreviewsmovies.com)
A simple smile and the occasional nod will show that you're interested and engaged. (entrepreneur.com)