Hm... trying to figure out what all can be done with this map to make it look a bit better without really cranking up the r_speeds. When you think about it, technically, a 4-story building with nothing but windows and stairs doesn't really make sense, nor does a section of city blocked in entirely by giant stone block walls. Maybe with some custom textures, you could make the walls look like buildings and give it a bit of setting.
Speaking of textures, you really need to put your custom textures in a subdirectory. I don't really want a bunch of loose files cluttering up the pball/textures directory.