Specifically, the red-haired, dusky-skinned one in sleeveless leather armour, drawing a bow?
I know you can get the bow and I don't mind about the armour; I'm more interested in the facial features and such, because I can never seem to find her hairstyle.

It's the same ordinary hair you can see on the 4th chick in the upper row in http://images2.wikia.nocookie.net/__cb20110824173307/elderscrolls/images/c/ca/Nords.jpg.

EDIT; didn't even notice it, it's the same one on the 1st chick too, it's just blonde instead of orange-ish.

http://www.truancyfactory.com/mods/skyrim/skyrim-loading-screen-characters.html

It's the 7th one down.

Ah, thank you! I worried it didn't exist.
Is it a Nord-exclusive hairstyle or something, given the models that its on?

Check the Bebop's link above your post. And no, afaik this hairstyle is a common one that every single race can wear (except beast ones, of course).

I was just about to suggest checking with Truant.