twinkle
verb
°(of a source of light) to shine with a flickering light; to glimmer.
°(especially of eyes) to be bright with delight.
"His shrewd little eyes twinkled roguishly."
noun
°a sparkle or glimmer of light.
°a sparkle of delight in the eyes.
"He was a rotund, jolly man with a twinkle in his eye."
synonyms: glimmer, scintillate, wink