iloco, i am not exactly sure what you mean, but my guess is that you are talking about clarity of render. Personaly i don't know of any big "secrets" or magic tricks, and i think i covered the basis of my lighting techniques in the bridge tutorial. Still, to sum up things, here are a few points to take into consideration if you're after a sharp render: 1) Haze is a bit of a catch. It is haze that gives the feeling of distance, and separates near from far, but overused, it becomes a definite picture spoiler. My advice, use the least amount of haze to give a distance feeling, not a drop more. 2) Watch that ambient light slider. If you can, use 100% diffuse and create the ambience with extra lights. 3) Shadow defines contours. Light coming from the direction of the camera or from strait above usualy flattens the image. Try using low angle sunlight or backlight. 4) I make the final render in "ultra" (Vue4) or "superior" (Vue Pro). All the lesser settings simply do not have enough antialiasing power. 5) A bit of color and levels correction in Photoshop or PSP will further enhance contrast. This is about all i can think of in this matter. I hope it helps :)