为蛇添足 (為蛇添足) wèi shé tiān zú

wèi shé tiān zú set phrase to add legs to a [drawing of a] snake; to ruin the effect by adding something superfluous; to overdo it
Domain: Idiom 成语
Notes: A variant of 画蛇添足 (Guoyu '為蛇添足')