finishing touch
noun/ˌfɪnɪʃɪŋ ˈtʌtʃ/
/ˌfɪnɪʃɪŋ ˈtʌtʃ/
[usually plural]- a final detail or action that completes a piece of work and makes it even better
最后的润色；画龙点睛 - He put the finishing touches to his painting.
他在画上作了最后几处润色。
- He put the finishing touches to his painting.