Despite my being one of the most stubborn supporters and promoters of True Ambience, I wouldn't recommend it for every type of image. Definitely for absolute photo-realism as the highest priority only, I would say. The advice given by Zhann and tjohn above is of the type that has served Bryce users well for many years before the advanced render options came along; and is a more fruitful avenue for a scene less demanding of 'every day' realism.