What you have now is some lightdome, and some fake hdri. Real HDRI (contact me for the site if you want to read up on it, its quite complicated, but once you get it, you get it)CANNOT be done in Bryce. Only fake HDRI. by putting a white sphere around your scene, and having reflective objects, your objects are getting white ambience from the surroundings. This is what the bryce sky dome does as well. However, if you put an image on that sphere, your objects now get different colors of light from the surroundings depending on the reflectivity. Thus, and image can be made with no lights whatsoever. A REAL HDRI image has information in it that Bryce cannot read. Lightwave can. But you can still use the HDRI image on your sphere. images on your sphere look best when they are spherical, and HDRI images are. But you can use any photgraph if you want.The best description of FAKING HDRI IN BRYCE is this: -Leave the sun on but disable shadows -Make everything at least 10% reflective (more reflective= more GI effect) -Add an image sphere or a white area or a sky around your scene. -Leave ambience at zero, and specularity zero (unless you want something that looks like plastic) -For objects you want to be reflective, make the reflective/diffuse ratio about 85:15. For matte materials, make the reflective to diffuse about 10:90. For a defined reflection, make the specular halo about 30-43% grey. For matte objects, make the specular halo 251-254. The rule goes, more white in the specular halo value = more reflection blurring. -Now turn on blurry reflections, premium, 32RPP, and render. TADA! Might take some tweaks but it works great. Also fast renders since there's no shadows (biggest render time hog you'll encounter. This was posted by someone else, who I will mention in the next post here.