Alisandra/Gallery
I know it's a cheat to use paintings rather than photos, but that's sort of the point: Alisandra is a character who looks like she's used a cheat code for Appearance. And there's really no good way to deal with that visually, because any image I pick is not going to look like that to someone, probably a large portion of someones. This is just the least bad option.
You can get a much better idea of Alisandra's looks by thinking of whatever dark-haired young woman you, personally, find most attractive, and then imagining that person painted in idealized soft focus by Waterhouse or Alma-Tadema or Frederic Leighton or some other late-Victorian era pre-Raphaelite stylist. Is it any wonder she wears sunglasses and cowls and shawls whenever she can get away with it?