Robert Genn says "Leave Your Lines In the Water"

Esoterica: By spreading yourself over several jobs at once, you amortize your creativity and give each work the advantage of contemplation over time. Amazingly, when you pick up a painting that has been abandoned for a day or two, you can often cut right to its problems and solve at least some of its weaknesses. This is also a good time to ask what more might add interest or depth to a composition. No matter how difficult the puzzle, you still have a fair degree of control. You need to keep your options open, ask "What could be?" and leave your lines in the water.