Rule of Thirds

 This photo is affective because the ball  is on the cross line of one of the thirds and there is a blacked out rock on one of the other third.

 This photo is affective because the boat lies across most of the picture even though it only passes through one of the thirds, there is also a rock in the background which crosses over in one of the thirds.

 This photo is affective because your eyes are drawn to the rock which is in one of the thirds which makes it stand out.

This photo is affective because the sunset is in one f the thirds which makes it stand out more than it would if it was in the middle of the photo.