This photo uses visual perspective element effectively. Because of the flower is more focused than the girl in the background.
http://cdn.instantshift.com/media/uploads/2011/11/eeofpp.jpg |
This photo does not use visual perspective. Because it is just focuesed on the bicycle.
http://cdn1.media.cyclingnews.futurecdn.net/2012/04/03/1/trekdomane_isospeed_side_600.jpg |