I really enjoy doing photography of buildings when the sky is mostly blue and there are some really fluffy clouds out to add some drama. When I look up at these towers and skyscrapers, its something I seek out when composing a shot. Can I find some clouds to make things look more dramatic, Sometimes the sun can play a part in finding it reflecting off a window, giving the eye a place to be drawn to. Seeing it partially obscured in the sky, using a smaller aperture to try and get a star point effect on the sun. These are the little things I like to look for to enhance my composition and add some more creative flare to things.
Beautiful pictures of these buildings, the perspectives make them look very striking!