锦上添花
add flowers to the brocade — make waht is good still better
e.g. 对于他们，最需要的还不是“锦上添花”，而是“雪中送炭”。
For them the prime need is not "more flowers on the brocade" but "fuel in snowy weather".
e.g. 这幅好画，再配上你这首好诗，真是锦上添花。
This beautiful picture is made even more beautiful with your excellent poem inscribed on it.
