when looking at this picture some people see a scary man and other people see a woman laughing
with a half closed eyes you will see the difference. or try with one open eye and close and open it fast to see the difference
Detail.
With half closed eyes you lose “resolution” (information), your vision gets a bit blurry and your brain relies on the larger areas of brightness difference rather than including/registering the more subtle grayscale values you see when your eyes are fully open. Pattern recognition and interpolation do the rest…
Nothing wrong. It’s a mix, here the woman smiling in the background:
You use a filter like Wavelet Decompose filter for GIMP:
https://www.google.com/search?q=gimp+wavelet+decompose
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