well... good idea, good start...
- Rock face walls like that usually have a cap, that is, otherwise the rocks on top get damaged, fall off, etc. A cement or stone 'railing' on top to keep the rockface in place. Also, reduce the intensity of the texture itself, it's a bit intense.
- Trees... ug... loose them or use a more detailed model... there are hundreds of freeware trees out there... worst case get a bryce or Vue user to create you a couple trees.
- Those two cement textures are showing up EVERYWHERE. enough said.
- That white building is either 12 hours old... or perhaps it's too perfect. needs a texture with a bit of weathering, plus those sharp perfect edges are more or less impossible and are traditionally more of a interior finish then exterior. White marble may work, but then you need to actually have tiles. Stucco would work, but then you need a stucco texture.
- The tile texture doesn't match/align with the tile geometry (foreground tiles). Need to create custom textures for each tile... or at the very least 3 or 4 different textures... rotated 90, 180.. which should cover the visible forground nicely. Add a few flaws to the tiles (geometry). Add a bump map to generate unevenness and a bit of noise to the tiles too.
- The maxwell sign is too featureless in it's reflection. You may wish to put a photograph of a generic street mapped to a large poly covering the background (behind the camera) Something for the letters to reflect... right now it's confusing to the viewer why they are plain and blank, where on the sides they reflect the rock. Plus, I've never seen a brushed steel sign like that... that thick... they often use a thinner metal simply to keep it from falling off under it's own wieght after a few years.
thats all I see.
I can't stress enough the importance of real world references. Go find photographs of various buildings and study how erosion affects various materials. If the goal is to simulate the real world and to fool the viewer, these minute but important details must be present.
cheers
ian