Just a few shots...

http://img527.imageshack.us/img527/6967/city1ib1.png

http://img524.imageshack.us/img524/1696/city2ug3.png

http://img159.imageshack.us/img159/8127/city3br6.png

http://img187.imageshack.us/img187/9273/city4sd3.png

I have to improve this cluster.

i like the tops of the twin towers :D... u can work on the facade a bit more, but great start, cant wait to c the entire start :D

^^ Same here..