Okay, Ron, here's the anser to lighting, from a former theatre and film person. 1:) There should be a single, brightest light in your scene. In an outdoors scene, it represents the Sun, inside it represents the closest light fixture. 2:) Directly opposite (from a top-down view) and on a slightly lower altitude (angle closer to the horizon) should be what's called a "Kicker" light - one that is dimmer than the main light, with a color tint to it appropriate to the mood you want. This should be the second brightest light in the scene, but no more than 2/3 as bright as the primary. 3:) There should also be from 2-3 lights called "fill lights", to simulate light that bounces around the scene, or Radiosity (as it's known in the rendering field). These should also be tinted, and no more than half as bright as the Kicker. 4:) For less dramatic, but more "realistic" lights, see REMC's tutorial on "Dome lighting". While producing amazing results, it slows down rendering time exponentially. Now, in a normal scene, the Main Light should be the only one with shadows on, but the shadow map should be set to at least 2048. Optionally, all the other lights can be set to shadows on, but set their maps to 256 or less. That's just the basics. Play around with your light settings to refine the mood you want. If none of your lights are casting shadows, you lose a LOT of realism.

Remember, kids! Napalm is Nature's Toothpaste!