But then there really wouldn't be a question at all, if all we had to judge from was the physicalities of the races.
The question would suddenly become "which race do you look like the most?"
In Tamriel, as well as in the real world, it is not difficult to see the different mentalities of the provinces/nations.
While these provinces/nations surely consists of individuals, you must not undermine the power of culture.
The Dunmer, in Morrowind's description of them:
"Dark Elves are the dark-skinned Elven peoples of the Eastern Empire. "Dark" is variously understood to mean "dark-skinned," "gloomy," and "ill-favored by fate." The Dunmer and their national character embrace these various connotations with enthusiasm. In the Empire, "Dark Elves" is the common usage, but in their Morrowind homeland, and among their Aldmeri brethren, they call themselves the "Dunmer". The dark-skinned, red-eyed Dark Elves combine powerful intellect with strong and agile physiques, producing superior warriors and sorcerers. On the battlefield, Dark Elves are noted for their skilled and balanced integration of swordsmen, marksmen, and war wizards. In character, they are grim, aloof, and reserved, distrusting and disdainful of other races."
Even Bethesda admits that there seem to be some general traits that can roughly be assigned to the races.
I know there are plenty of cheery and tolerant Dunmer, but as a people, they have been known to come off as gloomy and pessimistic.
Just like the Altmer generally come off as arrogant and a bunch of know-it-alls, and Imperials have been known to be shrewd merchants
and diplomats.
The Definition of culture:
The totality of socially transmitted behavior patterns, arts, beliefs, institutions, and all other products of human work and thought.
(Source: http://www.thefreedictionary.com/culture)
The first part: "The totality of socially transmitted behavior patterns..." is exactly what you describe in your post. Culture is not about looks, it's about behavior, art, music, architecture, mythology and so on. It's not about looks.
Sure, you may have a mentality that fits in the definition of a certain culture, sure, but it's different than being a part of that culture. A culture is made up of individuals who are all different. It doesn't make sense to say "I like to think about the universe, therefor I'm an ancient Greek", that's ridiculous.