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For example, if you raise an arm to the light, it could be a whole F-stop brighter in camera than your face (being the object closest to the source of light according to the inverse square law). It will also cast a shadow across you. You can counteract this by using your other arm (!)…or, move your arm a fraction backwards, away from the direct beam of light. Learning how lighting falls is invaluable. Ask which is your key light and then work towards it.
