Usually I try to capture the scene without making any changes to it, that is, the way any player would see it (except for an unusual angle, of course). But if there is not enough light in the scene, sometimes you can improve the situation by giving the character a torch or a lamp, thus highlighting the foreground. The light source itself is not visible in the frame. But here is a rare case when the added light source is visible right in the frame, and it becomes part of the composition.