/ic/ - Artwork/Critique

I can't understand when people try to explain light and shadow because when they draw the light source it's 2d. my brain can't make sense of a 2d object in 3d space. is the light in front of the ball or behind it? and the light in this picture is like 1 inch away from the ball. these kind of diagrams don't make sense and i can't take anything away from them :(