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Absolutely, sometimes it works in your favor! I tend to be more creative but less coherent at those times.

Yup! With time you will get better, but also coming back to the projects began, or even completed, during those times and fixing any tiny mistakes and errors can be very healthy for the artpiece :)

Doing that a bit here and there with some of my older pieces. Some are painful as-written, but have plenty of potential for clean up.

That's very good! :) As long as the original idea and motive behind it remains, it's great!