Ive only barely experimented with the Cove, so Ill tell you what I know thus far. In default, it works best with imported images that are square -- I think the ones that came with it were 2800 x 2800. Render the Bryce scene with the horizon just below the centre point; the default setting of 60/100 works fine for the Bryce camera. Insofar as lights... wow. Case by case basis, thats the best I can recommend. If you have colored lights in the Bryce and want to mimic that in Poser, Id focus them very tightly so they hit, as much as possible, only the Poser figure. Give the cove an overall illumination at the same time to bring it out. I would imagine that some of the lighting presets that were developed for nerds backdrop would work here as well. If you have the ones PW did for his prop, Id suggest trying them out on the cove. Id bet theyll work just fine.