Response to "How do you know when You're done"

How do you know when your done, a question asked by Anne Lamott, and answered in her response. She talks about the vision of students of someone pushing themselves away from their desk when they're done. Then, she counters when reality, and you are done when you cannot make any more changes that would make it any better.  She appeals to logos through the octopus analogy, making a logical comparison to writing and putting an octopus to bed.  The analogy is that it is hard, because when you think you've got it, there are more tentacles hanging out, like there are more things in your writing that could be changed.  She establishes her credibility through ethos because she is a teacher.  It has little appeal to pathos.