I wanted to say bosmer, because of my height, but everything else in me suggests nord. (I live in a nordic country, my roots digs deep in nordic countries)
Sullen countenance, imperious demeanour, and flamboyant robes? You must be a Telvanni Dunmer! I tend to sneer a lot too. I'd been Altmer but I'm too bitter.
I'd probably be an Argonian. They seem to fit my personality, and most people I've met irl think I look and act weird. Also I just think reptiles are really cool looking.