There is something distinctly 20's about the style here. I can see the reference to Agatha Christie, but I didn't consider her personally but rather that this could be a prop from one of her stories - "the murderous doll" or something like that.
I'm trying to determine if it actually looks like ink work or not and I'm not sure - I've not seen anyone do inking like this, especially the linework and curly bits in the shadows under her chin. It would definitely be a unique style though, should it be attempted!
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Griatch