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Warning: photoshopped portraits (and most of pro portraits ARE photoshopped, even slightly) may add "catch lights" in the eyes, to make the portrait more "alive"

So that kind of "clues" only shows that the picture has been processed, not that the people on the picture doesn't exists or is a deepfake

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And the non-professional pictures, like your everyday smartphone pictures everyone takes, pass through so many layers of computational photography that sometimes make it pretty far off from reality.

When I shot events years ago, I always used a flash for fill, even outdoors. People like the glint in the eyes that it added.

Before the photoshop times you could sus out lighting setups based on the reflections.

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