"Painting with light," i.e., setting up your camera in the dark, and then walking through the scene with a floodlight or such and illuminating the scene little-by-little, giving more light where you want it and less where you don't, is a time-honored method. I've done it with good results occasionally. It requires that you know your light intensity and exposure in advance, but allows you to work on one sheet of film.
A similar method is simply lighting one area at a time, leaving the others dark, and closing the shutter between lighting changes, basically making a multiple exposure, except that it's really a cumulative exposure, since the each area of the scene only gets exposed once.
If you're thinking of getting a Canon 6D, you're in the wrong forum here...
Best,
Doremus
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