笑容可掬

xiàoróngkějū
smiling wholeheartedly (idiom); beaming from ear to ear

CEDICT

to be radiant with smiles

Wiktionary

Entry Composition

1 笑容 xiàoróng
  1. smile
  2. smiling expression

classifier: 副
2 可掬 kějū
  1. conspicuous
  2. plain to see