Just for the sake of the argument, and for me the curiosity of understanding how things work, the lock of hairs was a bit strange, like the contour was drawn. Dunno if it depends on the lights, the render iterations.
If the many talented render guys we have here can explain what is happening I'm listening with interest.
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The same happened to the bow(?) on the back, again it feels like the contours are drawn like the a cartoon, or even it has been placed after the render.
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Again, I'm just curious to understand how it works, no criticism whatsoever