Reply To: J3loodT4lon's Art Room

[Herr D]

The technique Hawk mentioned is one I use commonly. Take any item in your picture; select another one, a few percent different in size, all three colors black and put it behind, protruding. For long shadows, mask that gradient circle to it to show instead and drop the second item to the bottom layer.

As for where? Experience is going to be long coming, but you could sample shadow patterns from other pictures with similar light patterns and objects from the web or IRL.