不吝珠玉

bùlìnzhūyù
(idiom) (courteous) please give me your frank opinion; your criticism will be most valuable

CEDICT

请对方不要吝惜宝贵的意见，多多指教的客套话。《初刻拍桉惊奇．卷九》：「老夫再欲求教，将满江红调赋『莺』一首，望不吝珠玉，意下如何？」也作「不吝金玉」。

重編國語辭典

Entry Composition

1 不吝 bùlìn not to stint; to be generous (with praise etc); to be prepared to (pay a fee, give of one's time etc)
2 珠玉 zhūyù
  1. pearls and jades
  2. jewels
  3. clever remark
  4. beautiful writing
  5. gems of wisdom
  6. genius
  7. outstanding person