The subject is in focus and the background is simple (monotone or plain).
The subject is in focus and the background is equally in focus.
The subject is in focus but the background is blurred.
The subject is in focus but there is little to no background. Subject takes up most of the frame.
A natural element frames the subject in.
Diagonal lines and "S-curves" draw the eye into and through the subject.
The using of leading lines + the rule of thirds + natural framing to lead the eye through a photo.
A photo that uses horizontal and vertical lines, very still.
Rule of Thirds
The subject is on a "third" of the photo. THE SUBJECT IS NOT CENTERED.
The only exception to the Rule of Thirds. If the subject is in the shape of a triangle, it points to the center of takes up most of the frame.