Greg DeAngelis discussed the various rules & guidelines for composing the most impactful images. Many are common sense and we follow them instinctively like the rule of thirds, leading lines, and groups of three. In western culture we are predisposed to reading left to right so be sure to leave space to the right of a moving subject. Foreground anchors can lead the eye into the image but they can also block the eye if they are too big or extend across the entire frame. Some scenes just naturally work better as vertical or horizontal images but experiment and try both. Centering subjects, although against the "rules", can work well for example with flowers. Be sure to crop in tight and eliminate distractions but it helps if each corner of an image looks slightly different. Birds are best taken at eye level and slightly from the side, their faces look odd when seen head on. Layers in a landscape are attractive but don't put the horizon in the center and be sure it is straight and not crooked. Famous sites are still worth photographing but slow down and attempt different perspectives, for example using wide angle and telephoto lens.