"Expression over Perfection" - common phraseology in portrait photography, simply means the technical aspects of a photo: lighting, composition, exposure, tone, etc... will always take a back seat to the expression and emotion of your subject. Yeah, all that other stuff is really important... But great expression is way better than technical perfection. I've learned that portrait photography is about 25% technical, 25% creative, and 90% interactive. Simple mathematics.
photo jabber blog by tim wyler
simple digital photography portrait tips