When is a painting finished?

Well, evidently, not when I say it is. My good friend Richard Ignarski bought this painting yesterday but as I was getting it ready to ship, I thought I could improve it:

Daily Whipout #418, "Texas Ranger Border Greeting"
"Every painter needs another painter standing behind him with a mallet: Stop! It's done! Give it up! Don't make mud!"
—Walter Henn, the late artist and husband of Nora Henn, Lincoln New Mexico