画蛇添足 (huà shé tiān zú): lit. draw legs on a snake ; fig. to ruin the effect by adding sth superfluous; to overdo it
画蛇添足
lit. draw legs on a snake ; fig. to ruin the effect by adding sth superfluous; to overdo it
From a contest to draw a snake fastest: the winner added legs to show off and lost. Said when an extra touch wrecks something already finished.