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Ok in your methodology they were lighter. But I'm very sceptical for usefulness of photography to estimation of hair color.
For example me when I was in school. On first photo I was looking light or medium brown, on second very light (and it was taken year or two years later). In fact I was in the middle between those two images, on second photo must be strong sunlight. Now I'm much darker btw.
So how many times you saw such images with not proper lightning conditions?
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