画龙点睛

the brush stroke that dots in the eyes (idiom); fig. to add the vital finishing touch; the crucial point that brings the subject to life

to add the finishing touch (abbr. for 画龙点睛)

lit. draw legs on a snake (idiom); fig. to ruin the effect by adding sth superfluous; to overdo it

to touch base matter and turn it to gold (idiom); fig. to turn crude writing into a literary gem

lit. to draw blood on the first prick (idiom); fig. to hit the nail on the head