Dot the be and cross the T's.
画龙点睛。
make the finishing point
画龙点睛
Add the consummating touch
或
Make the finishing point (但这个翻译没有使之完善,完美的意思。这是金山词霸的翻译)
Putting the finishing touch to the picture of a dragon
put a cherry on the top
add the finishing touch
make the finishing point
这盏灯对我的房间的装饰起了画龙点睛的作用。
This light adds the crowning touch to my room decoration.
Make the finishing point
to bring the painted dragon to life by putting in the pupils of its eyes