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Doing adjustments with curves or contrast will only help your photo reference if the information is there in the shot to begin with. When a large section of the face is completely bleached out to white there is almost certainly no data there on the film or in the digital image.
No amount of adjustment after the fact will tell you exactly where the forehead turns and by how much, or what color would be in the side of the cheek compared to the side of the chin, for example. You have to get the exposure at least close to being correct when you take the photo.
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