HSK 7-9
锦上添花
jǐnshàng-tiānhuā(lit.) to add flowers to brocade (idiom); (fig.) to make sth good even better; to add an extra (often nonessential) benefit or embellishment
灯光让舞台效果锦上添花。
Dēng guāng ràng wǔ tái xiào guǒ jǐn shàng tiān huā.
The lighting made the stage effect even better.
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Appears across levels (7-9) in the HSK 3.0 word list.