The third element of composition is:
Rule of Thirds
place points of focus at thirds rather than center, center on the x- and y-axis
This photo demonstrates the Rule of Thirds element pretty well.
I placed the point of focus (the shoreline) two-thirds of the way down the photo, instead of smack in the center. It's not always the way to take a photo, but sometimes it gives a great effect!
P.S. I know the quality of the above photo is pretty bad...but I couldn't put a grid on it in my photo editing program so I had to do it in my graphic editing program. That made the photo awfully grainy. Apologies. *sniff*