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. (For those with more Renaissance tastes, consider Botticelli or Fra Lippi.) Is it any wonder she wears sunglasses and cowls and shawls whenever she can get away with it?