Like the night elves and golden eyes, each race actually has a physical indicator of importance.
Dwarf: has to be drastically altered. Regular dwarf? Lame. Fire, diamond, or metal dwarf? Important.
Gnome: have you guys ever heard of an important gnome? That’s because they don’t exist.
Night elves: golden eyes, the shinier the better. Illidan, the new messiah’s, eyes are basically just two damn flashlights in his skull.
Worgen: the more times a worgen does the idle sniff animation, the more important it is. In human form it’s still angst, but British Angst.
Important Pandaren are the ones with a blue exclamation point over their heads, as dailies were a Fun and Important part of their continent.
Orcs: looks identical to thrall, because he is the only important Orc lorewise
Trolls: actual good posture instead of slouching. Vol'jin demonstrated this for about two seconds in SoO, right when his potential as a character peaked and immediately died out.
Undead: important male undead always look as gross as possible, but important female undead always have intact boobs.
Tauren: Tauren are special, as they are two-dimensional unless interacted with by an Orc, such as thrall or garrosh. If you see a Tauren displaying actual character traits, they have a great destiny ahead.
Blood elves: have no outward physical displays of importance, as they will tell you themselves.
Goblins: have they even done anything since cataclysm? If they have, they’ve poured all their focus into making money instead of developing physical indicators of importance.