The elements that you incorporate in your frame establish a very significant visual dialogue. Here it does not matter how "noble" or "beautiful" the objects of the captured reality may or may not be, but the qualities of the representation. In this sense, I can warn that the plastic composition would be given by two equivalent oblique lines: the one of the right lateral wood of the staircase and the one of the shadow on the wall (also that light bias to the left of the bucket). Then two vertical lines: the one of the shadow on the wall (which forms an angle with the oblique) and the one of the shadow in the central part of the body of the bucket. The horizontal lines of the two rails of the staircase should also be considered. The bucket with its shape and volume, between the oval (above) and also some obliquity on its outer edges, incorporates this set of lines in unstable equilibrium. Of course, in this composition, lights and shadows play a key role. I liked doing this descriptive exercise with your photo, @velimir. Greetings.