In this case I am using warm and cool hard flash lighting to create dimension.
Sometimes I try to turn accidents into keepers with a little experimentation, like in the photo below where the side flash was too strong. Not every photo has to be success if you learn something from it.
The next test was to light an interior room subtly while maintaining detail in the sunny outdoor scene.
The final test was to use window light as the 2nd light in a 2 light set up. Daylight is free and it adds extra dimension on the shadow side of the subject.