My friend, who is a long time quilter and has won many blue ribbons, told me when I was first starting that if a man on a horse galloping at 20 mph couldn't see it from 2 miles away, it was good.
Although I happen to know that she rips out and re-sews at least 3-4 times. :-)
Useful comments above me. Quilting is so therapeutic; just have fun with it!