The perfectionist fixes one line of a poem over and over until no lines are right. The perfectionist redraws the chin line on a portrait until the paper tears. The perfectionist writes so many versions of scene one that she never gets to the rest of the play. The perfectionist writes paint creates with one eye on her audience. Instead of enjoying the process, the perfectionist is constantly grading the results. For the perfectionist there are no first drafts, rough sketches, warm up exercises. Every draft is meant to be final set in stone. The perfectionist is never satisfied. The perfectionist never says "thats pretty good. I will keep going". Perfectionism is not a quest for the best .It is a pursuit of the worst in ourselves, the part that tells us that nothing we do will ever be good enough.
From The Artist's Way by Julia Cameron. I dont rate this book but she got this part bang on.