Properties of Light

Looking at the photos of the real world is the best way to study the properties and behavior of light. Such understanding will give us a better control over how we light our scene and making it look more natural, and as realistic as possible. There are other properties that govern how "real" a scene can be. Apart from having good textures and modeling, lighting is something that could push a scene from good to great.

These are just some of the examples as good references. Plenty are out there. Start collecting now.