Are we as artists ever truely satisfied?

Now thats a good question...a friend of mine Posted a new art piece of hers on her Facebook album recently.  She is a wonderful artist and works mainly with pencil, she is truely gifted. (there is a smidge of envy there). I sent her a comment on how beautiful it was, and it was stunning in detail.  It was of a clothed woman floating in a stream, with details of the banks of the stream and foliage and butterflies.  The next day she sent me a reply of how it wasn't finished and how it could be better.  I thought she was crazy, but then I realised that with all artists, including my self, that we are never 100% satisfied with the work we labour over, and it sometimes takes a bolt of lightening or a knock on the head for us to admit that we have completed a peice of art fully. I hope to make a note of this for the future when i'm fussing over my work.....well heres hoping!