This photo of a broken clock shows simplicity. The clock is against a clear background, there is nothing in the background that might distract to viewer. All the attention is brought towards the clock.
This photo of a small monkey on a girl's neck s creating depth. The photo creates depth by blurring the girls face a little bit, which draws more attention to the monkey biting her ear.
This photo of Mitt Romney is using the rule of thirds method. Romney is against a clear stated background with no distracting objects. He is also not directly in the middle of the photo which makes it more interesting.
This photo of a royal soldier is creating depth and avoiding mergers. The photo creates depth by blurring the background behind the soldier which brings all the attention to the soldiers face. It is also avoiding mergers because the soldier is clearly appears to not be connected to anything else in the photo.