facial expression, facial gesture - a gesture executed with the facial muscles

smirk - a smile expressing smugness or scorn instead of pleasure

dimple - produce dimples while smiling; "The child dimpled up to the adults"

grin - to draw back the lips and reveal the teeth, in a smile, grimace, or snarl

beam - smile radiantly; express joy through one's facial expression

simper, smirk - smile affectedly or derisively

sneer - smile contemptuously; "she sneered at her little sister's efforts to play the song on the piano"

grimace, make a face, pull a face - contort the face to indicate a certain mental or emotional state; "He grimaced when he saw the amount of homework he had to do"

evince, express, show - give expression to; "She showed her disappointment"