This website suggests you taking photos with your digital camera upside down to get the best results. It has to do with lighting angles and facial features having a better look when the camera is upside down.

Read on:
http://www.digitalcamerau.com/2006/0...ter-portraits/

Site contains a sample of this but to be honest I could barely notice any difference at all... but perhaps if you try it yourself you'll notice the difference.