Laurie recommended using Bagginsbill's envsphere to build your scene if, indeed, the scene occurs outside.  In this next render, I incorporated BB's envsphere along with the ground mesh from Terradome.  The sky image was supplied by BB, found at his free site.  In this particular instance, I used the same sky image in my IBL, which originally had none.  The imaged IBL will output the image color data into the scene, creating an ambient blue illumination into the scene.