点睛之笔

to paint a dragon and dot 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)

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

one word says it all (idiom); to hit the nail on the head

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

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