I had a bit of a wake-up call last week. The family portrait that I finished was not liked by the customer, and was returned to me for additional work. This was especially disappointing to me because the things that she didn't like about it were the parts I was least happy with before I finished. If I had spent more time on them before completion, it would have probably been acceptable.
Now I have to try to correct my mistakes, as well as complete my next commission by Friday.