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谚语, 成语 and 歇后语

Fill in the eyes to a painted dragon.
画龙点睛 (Huà lóng diǎn jīng)

Pluck flowers as they bloom; wait and you’ll have only the twigs.
花开堪折只需折，莫待无花空折枝 (Huā kāi kān zhé zhǐ xū zhé, mò dài wú huā kōng zhé zhī)

Draw a cake to satisfy one’s hunger.
画饼充饥 (Huà bǐng chōng jī)