huà shé tiān zú

画蛇添足

to ruin something by adding superfluous details; to overdo it

HSK 7+ · Frequency 2.2

Meanings

to draw legs on a snake
to ruin an effect by adding something superfluous
to overdo it

Example sentences

结尾再加这段话就是画蛇添足。
做好本分即可不要画蛇添足。