錦上添花 [ㄐㄧㄣˇ ㄕㄤˋ ㄊㄧㄢ ㄏㄨㄚ; jin3 shang4 tian1 hua1]
  lit. on brocade, add flowers (idiom); to decorate sth already perfect
  gilding the lily
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  錦上添花
  きんじょうてんか
  noun (common) (futsuumeishi)
  adding a crowning touch of beauty (to)
  giving added luster (to)
  crowning beauty (honor, grace) with even greater glory
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