Zhège shèjì jiǎnjié dàfāng, zài jiā zhuāngshì jiùshì huàshétiānzú le.
This design is simple and elegant; adding more decoration would be gilding the lily.
Tips
history
From a Warring States story: after a drinking contest where the first to finish drawing a snake wins the wine, one man finished early and arrogantly added legs — only to lose because snakes don't have legs.
usage
Used to warn against unnecessary additions that spoil something already complete. Often appears as 别画蛇添足 (don't overdo it).