I think we all do that. A month is enough time to get something up and challenge our inspiration/wits. When we get away for a while and come back later, the image grows. I've revisited some WIPS from a year ago and finally did what the wip needed. Sometimes, after signing a graphite and giving it away, I see it years later and immediately know what I should have done differently. That's the part about stretching and growing. The challenge stretches us, time grows us. When both are in place, the work is superior.