画龙点睛（畫龍點睛）　

◎ 画龙点睛 huàlóng-diǎnjīng

[add the touch that brings a work of art to life;add a word or two to clinch the point;put life into sth.like dotting the eyeball in painting a dragon] 以唐·张彦远《历代名画记》所述张繇僧画龙点睛的故事,比喻绘画、作文在紧要之处加上一笔,使其灵活而有神