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All the time! But I feel that in both the images you refer to the light is motivated. That low light under the guards face is motivated by daylight hitting the floor and bed before reflecting up. Yes, the effect is enhanced but I still feel the light feels like it is natural effect rather than not.
That second frame is simply lit by soft light from the window. Again, the effect might be enhanced but the motivation is a natural source.
I am trying to think when I have used an entirely unmotivated source. It is true that most of my work could be considered as always motivated by the way natural light works but the divide between the altogether natural and completely stylized is pretty vague.Back to Lighting...