Idioms  - 画龙点睛【huà lóng diǎn jīng】

画龙点睛比喻作文或说话时在关键地方加上精辟的语句，使内容更加生动传神。
It refers to using incisive oyrasing at crucial junctures when writing at speaking, thus making the content more living and vivid.

画龙点睛[huà lónɡ diǎn jīnɡ]
Bring the painted dragon to life by putting in the pupils of its eyes——add the touch that brings a work of art to life; add the finishing touch; add the touch that brings a work of art to life; add the finishing touch; add a word or two to clinch the point.

造句Sentence:
Jié wěi chù duì xiàn zhuàng de pēng jī ，shì quán wén huà lóng diǎn jīng zhī bǐ 。
结 尾   处   对  现    状        的  抨 击， 是    全    文   画   龙   点    睛 之 笔。
The criticism leveled against the existing state of affairs at the end of the article is what clinches the point.