system
A chat on 4chan
human
>'something-off' humans

Let's see:
* Unusually prominent teeth
* Sunken, dark, large eyes
* Pale skin
* Thin and spindly

A dead body, particularly a diseased one.
gpt
You're merely manipulating what 'something off' has to mean to lead you to the answer you already want. Just one of those categories could lead to something seeming 'off' about someone, without seeming dead like all of them in conjunction. Furthermore there are other ways someone could look 'off'.
And I don't know where the pic in OP is from, but she doesn't look dead to me. I don't think the idea of walking diseased corpses is something early humans would have even conceptualized on their own (unless they encountered something looking like one of course).