Texturing Walls Bump Map

Here is my latest render of the walls and pavement shot through a render cam with one directional light pointing at it. Current I have mapped a diffuse (colour map) and a bump map to each surface. The bump maps purpose is to give surface detail to the geometry that would require many polygons to describe whereas the actual geometry in the scene is only 2 polygons. This demonstrates how good texturing helps you be economical with your modelling.