Have you ever heard of the japanese word “wabi-sabi” before?
Wabi-sabi represents Japanese aesthetics and a Japanese world view centered on the acceptance of transience and imperfection. The aesthetic is sometimes described as one of beauty that is “imperfect, impermanent, and incomplete”.
Most of the times it is quite possible to get hung up on attempting to perfect a work. The ultimate reality is nothing is ever perfect, and can never be. Rather then wasting time chasing after this illusion, the best would be to quit working when you have a sense of feeling that you put most of your ability and efforts into it. You give yourself some time, rest on it, and if you still feel like it needs more work, you can always come back and improve it later.