Actually, the real purpose of this image was the building of a Bryce environment without any of the Bryce sky.
Everything in the image is inside one huge terrain. This is a secret to good-looking Bryce outdoors scenes, by the way; scale. You can use a degree of forced perspective (which this image does), but mist, haze, materials, lighting, will all look more realistic with some degree of the actual size.
In any case, the light-proof shell blocks the default Bryce sun. Inside, a single radial provides most of the light. Haze provides the blue of the sky. A cloud plane adds the clouds.
Around the foreground wagon are a few small spotlights to lighten the shadows. There is another extremely narrow spotlight pretending to be light reflected from the sun off the water. The lense flare was added in PhotoShop.
It needed something to set the scale and to provide an observer, a "presence." Since I didn't have Poser or similar I knocked together some salamander-like creatures using Bryce lattices, and built a wagon for them to draw in Ray Dream.
The part that was fun was creating a strange ethnic cloth, looking vaguely Arabic or African, for the wagon cover. I imagine these are gypsy traders, passing through many of the strange lands in these interconnected caverns far beneath the earth.
