Not just sister, but wife of Osiris...
Even if I didn't know the story, I still see a very young woman photographed from slightly above, which in spite of her direct gaze makes her appear submissive, which makes me a little uncomfortable. Being aware of the incest story just reinforces that. Very dark thoughts!
Also, of course, I see Elizabeth Taylor in Cleopatra. You didn't have a Richard Burton back there did you?
Thom