Lately I've noticed a lot of praise for composition in the Poser Galleries. What makes a composition great?

Are there some rules that you ought to follow - and perhaps break, once you know them?

Some things I wonder about:

• A single figure in an image placed on the dead center -- or perhaps on the golden mean
• The relationship between foreground and background
• Making the image dynamic, yet balanced
• Creating an interesting path for the eye to follow
  Etc.

What do you think?