In my (limited) experience, to a (very limited) extent physical appearances do reflect the person inside. Somewhat. I'm not talking about attractive vs non-attractive here, but rather.. whether or not he is 'dominant'. Looking quiet, composed, good-guy etc actually can suit a dominant -- the leather-pants, bald, tattooed guy is a tad TOO stereotypical in my opinion.

But how about if you see a tiny guy with a shy, nervous smile, eyes that just can't seem to look straight at you, all geeked-up with uncombed hair, thick-rimmed glasses.. you get the drift. In my humble opinion, that simply isn't how a dominant would portray himself to the world. Even if he WAS tiny and couldn't change that, the way he looks at you, or smiles, etc is completely dependent on his style and personality.