Reworking old stuff

Does anyone else "stew" over what is wrong with a tile?  When we did the poppy a couple of weeks ago, I was very dissatisfied with my submission but couldn't put my finger on what was missing.  I decided to try some new water color crayons and by jove, I think I fixed it.
I also like the idea I have read about copying the original onto some good paper so you can experiment without ruining the original.  Great idea when you have a treasure.  This was not a treasure but it just bugged me that something wasn't the way I wanted.
What do you think?