When we begin the process to create a new painting we sometimes have the illusion an idea could be expressed in many ways.  And of course, in reality, this is true.  However, as the painting develops it becomes clear that there is only one way it wants to be.  So maybe there are endless possiblilites but at any one point a painting just has to be as it is.  This is one reason why it is crucial to fix errors as the arise, because all work that follows will be built on what is there….and if it is wrong, well, you see the point…