Window light is a beautiful form of illumination for portraits. This shot I took a couple of days ago on my Venice photo workshop is lit by two sources – the window and the sconce. I used daylight white balance, allowing the golden, tungsten lights to go very yellowish. I also refrained from using fill flash here because I like the moodiness of the light. The bowed head suggests contemplation in the masked model, and I think that adds to the mood. Everyone in my group got the same picture or one very similar to this one.
I shot this with a 24-105mm Canon lens, and the exposure was determined by the built-in light meter on Program mode. I used the exposure compensation feature in the camera to tweak what the meter dictated. That was necessary because the bright window caused the original exposure to be too dark.