I love it. It's hysterical that this looks great even though there's a random tree stump in the foreground and grass growing on tile. The color is beyond excellent. I gotta know, did you hack some of the materials? The ceiling and right wall have the same color, whereas the left wall doesn't. It makes sense because the light is coming from the right, so the right wall would be brighter and light would reflect onto the ceiling. Did you just use different material colors to hack the impression? The colors you achieved there are really really impressive man. If you hacked it or not doesn't matter. The result is beautiful. I would totally appreciate a breakdown. This is simply not accurate. Post doesn't work like a photoshop filter, it has access to layers and layers of additional data. You have depth, light info, normals, positioning, distance from camera, etc. Slap AO on the camera, and look at how it responds to changes in lighting intensity the angle of lighting. Again, stuff like adding color bleed to AO is going to have as much or more effect than some GI on how lighting feels in some scenes. What's more, stuff like tonemapping and eye adaptation or color balance can have dramatic effect on our impression of light and dark. Just check out how much of an effect tonemapping has on light, shadow and falloff. Depending on how eye adaptation and tonemapping is configured, it can completely change how strong a light appears and how much falloff it appears to have. Any kind of volumetric post effect (fog, scattering, etc) is going to add depth and change the impression of distance and how light interacts. Post is really part of the lighting process at this point. It's not cheating or faking, many of these things are designed to work together.