One natural lighting tip that can improve your images.  

"Only difference is the color of the shadows" And, you know, the walls

It reminds me of getting a handle on how to use my speedlight and the pictures had a brown cast to them. It took me a while to look up and be reminded I'm in a loft with uncovered beams, all stained . . . brown! Same thing happened in a house taking a shot of a grey statute but the walls were dark brown. It matters!