And it is lights and shades that I too am working on! :) I'm still trying to figure out exactly where the darker shadows should go on a complex image and how to add the light element to said picture... A fun image to work with for shadows was this Cinderella stamp from Kraftin Kimmie.
Kraftin Kimmie's challenge: gold. :) These images have so much depth to play with so I'm thinking I'm going to have to dig 'em out more and more! :)