• Light Quality: The hardness or softness of the light. Soft light is the standard because it's more flattering and aesthetically pleasing from a traditional perspective, but don't shy away from hard light sources if it will help key the audience into a character's state of mind or emotion.
• Light Intensity: The brightness (or lack thereof) of different lights throughout the scene. Manipulating intensity is a great way to create contrast in your scene and to guide the viewer's eye to key points in the frame. Varying intensities of light are also an incredibly effective way to create depth in a shot.