Smiling children.
Smiling takes fewer muscles than frowning.
They were smiling at the children.
Alex walked into the room, smiling when he saw what she had done.
She suddenly paused, smiling at her own impetuosity.
He considered, smiling to himself.
Vanna White in sheriff's duds, but with anything but a smiling attitude.
She was still smiling when she walked back into the kitchen.