In answer to your question about the Muse driving us to improve the work even when it is not reasonable---there is a resounding YES from this artist! I have paintings that are under glass (and have been under glass for a year or more) that I still want to work on! I guess it's because we grow and improve as artists ourselves. Are we ever finished mothering our children? I still find myself giving advice to my grown children. I guess it's the same with my paintings. I still want to improve them, even when it's not possible to work on them anymore.