Mood and atmosphere
Source of light
When adding to existing light, try to make certain that the new illumination and shadows created are consistent and logical with the original light sources that appear in the frame.
A window in an interior shot will be seen by the audience as the main source of light. Additional lighting should be positioned out of frame to reinforce the direction of the perceived main source of light. The keyed side of the face should be on the same side as any lit practical in frame (e.g. table lamp beside the subject).
If there is no apparent source of light within the frame, then lamps can be placed to suit the subject depending on the practicalities of placing the lighting stands and the requirements of the shot.
Think ...
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