Two important elements of a photograph's composition are "leading lines" and "light". The eye is drawn towards the brightest spot(s) in a photo and a line, natural or man made aide in leading someones eye.
This photo uses the lighter bench on the bottom left as an anchor, then the path leads the eye into the heart of the photo, with the brighter sky as another draw of the eye.
A properly composed photo rarely happens by change. Next time you are out shooting look for leading lines and light as a way to create interest in your images.
If you want to learn more you can check out our "Composition Workshops" here