计划已经很完美了，不要画蛇添足。

Jìhuà yǐjīng hěn wánměi le, bùyào huàshétiānzú.

The plan is already perfect; there's no need to overcomplicate it.

他喜欢画蛇添足，总是做一些多余的事情。

Tā xǐhuān huàshétiānzú, zǒngshì zuò yīxiē duōyú de shìqíng.

He likes to complicate things by adding unnecessary details.

这个方案已经足够好了，不必画蛇添足。

Zhège fāng'àn yǐjīng zúgòu hǎo le, bù bì huàshétiānzú.

This plan is already good enough; there's no need to add unnecessary details.