Be (one's) own judge

Translation of "be (one's) own judge" into Russian

быть (самим себе) судьей

You must be your own judge of whether your work is good enough.

Вы должны быть сами себе судьей в том, достаточно ли хороша ваша работа.

To make decisions or form opinions independently, without relying on others' input or authority; to evaluate or assess something for oneself.