Beauty is in the eye of the beholder! That is the motto i follow, though sometimes I add 'of a beer bottle' at the end of that sentence.
On a serious note, I think the way a person act and dress largely affect the person's beauty. The happy, clean cut and casual me in a set of clean clothes looks much better than a grumpy, moody and sad me with baggy cloth. After observing those around me, I found that it applies to pretty much everyone!