One of the main aims in composition is to try to achieve Leading lines, that is to draw you viewers attention to the subject.
So for this theme I want to to achieve leading line's on you photo. here are a couple of links to show what I mean.
http://www.steves-digicams.com/knowl...otography.html
http://www.google.co.uk/search?q=lea...w=1536&bih=738
Good luck
Usual Rules apply