The composition zone: Composition is of paramount importance to any photo of excellence and requires an article on its own. Sofar I know about 27 different ones like, the golden rule, rule of three, leading lines, s-curves, pyramid, negative space, centered symmetrical, radial, foreground interest and depth, frame within the frame, diagonals and triangles, patterns and textures, rule of odds and even, fill the frame, simplicity and minimalism, isolate the subject, point of view, color combinations, rule of space, left to right rule, juxtaposition, golden triangles, figure to ground, center dominant eye, break the rules and so on, but the one I find the most interesting is what some painters are using in their work called the balancing scale.
Balance is the visual weight or equilibrium of the objects within a composition that is seen or felt by the viewer. It Is the ability to arrange all the elements so that no one part is overpowering. Definitely worth some research on the net.