Noise is what gives you the photo like feel. This is because photographic film is very grainy. Look at some negatives under a magnifying glass to see what I mean. Unfortunately, you can't ever get this effect exactly in 3d art, because a pixel is at least 4 times bigger than a film grain. You could get it only if you renderedf at 300dpi/ppi and then printed the image. Unless people have super high res displays capable of displaying a 300dpi image, then all it does it look really big for everyone. You can however come close...One way to acheive this effect is to use post work with some sophisticated noise filters and grain. Other 3d applications have this capability built in. It is reffered to as entropy or grain or texture or whatever. In bryce, you can fake this by doing the following: Setup your scene. Make sure shadows are set to below 60% if you are using the sun, enable soft shadows. Make EVERY MATERIAL AT LEAST 9% reflective. Enable blurry reflections in the render options. Set the Rays per pixel to 16. Do a plop test render and notice the noise effect. For more reflective materials that you want to have sharp reflections, make the specular halo below 50% grey. This will blur the reflections less. For materials you want to look non-reflective, set the specular halo to 98% white. This will blur them as much as possible.