The snarky, arrogant, heartless expression Jensen has adopted as Demon!Dean is what sets him apart as an actor of the highest caliber. A different hairstyle changes him somewhat, but what finally makes him so different is the look in his eye, the set of his mouth. He is a master at controlling his expressions to fit the role. This doesn't look like Dean at all, but someone entirely more evil.....
Well, it didn't take the Supernatural fandom long to get here.
Taming the Moose. Why is this sexy? I don't know but it is. 4x01 Lazarus Rising