Spirit Guide / WIP / How do you know when art is finished?

I currently have a number of artworks that are still in the WIP phase. Depending on my mood of the day I can play with a WIP and change layers, add, delete etc. and make something entirely different. I may like it that day, for that specific mood but then change my mind the next day and prefer the previous version. I can be so fickle about my art 😂

Usually I just decide to publish in one ff those moments where I get that satisfied feeling, otherwise I would probably never end up sharing anything.

Here is the current full WIP:

How do you know when an artwork is finished?