You mentioned that you wanted Amelia to look like a femme fatale or silent film star, and I kept thinking of Louise Brooks.
Yeah, Louise Brooks or Theda Bara. She starts off the book looking more like a normal person than when it ends. There's a physical and mental transformation that happens when you're around these objects. For some, you become a Nosferatu. Amelia starts the book wearing a hoodie and looking like a person you would interact with in the normal world, and she ends as a vamp.
This homage to Louise Brooks represents one of a number of comic book nods to the actress going all the way back to the 1920s.