Richard,
One of the things I consistently notice while working from life - is what I don't notice until the next morning when I come in and look and say "ARGH!"
Seems to be something about it - at least for me, and I wonder if it happens to others as well - that while I am working, somehow I just don't see the areas of trouble. I wonder if we get too "close" as it were to the work and enamored of what we see...
Fresh eyes the next day show a lot.