1.   The winsome smile flickered back with its sly message.

2.   A smile flickered across her face.

3.   A tired smile flickers across her face.

4.   For example, stern and hard-minded one moment, Hurt allows an ironic, self-deprecating smile to flicker the next.

5.   They looked on and commented in Kinyarwanda, the national language, smiles flickering occasionally on their lips.