Re: Erik Almas
D- It's usually many more than just 2 shots but you do have to consider the light source and its general direction. Just as important is shadow as it also directly relates to the same light source and correctly placed, reaffirms the illusion of reality within the composite. Once you decide on the direction of light you can use several techniques for consistent lighting within the composite: Photograph in studio using controlled lighting per your specs, flip the object(depending on concept layout), or use dodge/burn effects to name a few. The D&B is much easier accomplished when the object(can be background, sky) is photographed in more of an even or "flat" lighting situation. Also, remember when compositing a night or indoor image you can have multiple light sources that need to be considered.
Thanks for the kind words as well and I hope I've helped a little...