Well, when I watched Janet Rogers give her demo last Tuesday in class, she noted that she likes her finished paintings to look like they are unfinished = not too perfect or complete but always knowing that less is more to the look of watercolor. Wish I could just stop and let it be at a certain point, too, when I'm still liking it. But that doesn't seem to happen with me - I charge right through to finishing it off farther than it needs.
Oh, well, still learning all the time. And I have another one started for the color group but I'm going to build up the colors slowly with that one - until I get bored and then start rushing again!