Usually, when I try to explain how I decide to frame a scene in the camera's viewfinder I have trouble describing exactly what it is I am trying to do –– what I am looking for. In the past I've simply said I pay attention to the edges of the frame until "the image resolves itself." True enough but not sure how helpful that is.
Well, I came across another description of the process and, though it may not add much to the discussion in terms of specifics, it struck me as a more elegant description of what occurs at the moment a photographer decides that's the shot. It's from John Szarkowski's introduction to the book: "William Eggleston's Guide:"
"... a photographer wants form, an unarguable right relationship of shapes, a visual stability in which all components are equally important. The photographer hopes, in brief, to discover a tension so exact that it is peace."