I try to use all of my senses when describing a setting, and try to think of everything that would impact a character in any given scene.
Knowing that I'm not a model and I'm never going to be has relieved me of the pressure of looking good. If you don't establish yourself as McDreamy then you don't have to live up to it.
I remember being told 'Someone's gonna make a fortune out of this rap thing' and thinking 'no way'.