Hey there, looking good !
Some c&c, try looking in the hypershade to delete the 'optical fx' Or if you changed it's name look for that :p.

The hill on the back look kind of unrealistic, so if you want to change that it depends on what you will do in the future. You are creating a town scene, so I presum in the final render some building are going to be in front of it? If not, try adding some dirt, colour variations, small bumps in the texture.

Second: The nice thing in the middle is constructed out of... marble? And even if not, it would be cool just to set the reflectivity value a little bit higher, so that it looks more clean . The thing on top of it could look really cool if you made it some more transparant and add some colour noise into it, and make it the colour of the rainbow (that way it can look as if it's class, witht the suns ligt breaking trough it and displaying seven colourd. Phew, who needs refractions :p).

I hope I inspired you .