The definition in the eye of this cat is what brings the attention to the photo. It also has a very small part of the photo in focus and the rest is blurred so that you can still tell where the rest of the cat's body is but it doesn't impede on the subject. I believe this photo use the rule of thirds.
Beautiful photo macro
Colorful Arches (Photo by Tony Karp)
Curious frog peeking over heliconia