I have to agree with Shiro. In both design and coloration your Chinese city appears more Japanese than Chinese. I would suggest making some of the walls a bright red.
I agree.
Futhermore, the ancient Chinese city complex did not look alike, but rather similiar to Japanese cities
Four points, here are as follows:
(1) Buddist religion was not spreaded into China yet and Daoism was not been established, therefore pagodas or towers did not came into existance. Nevertheless, there had been a five-storeys tower in the marketplace in Chang'an of the Han Dynasty, but obviously the size of the tower in the city graphics is exaggerated
(2) Here is a pic about a drawing of Weiyang Palace, once where the royal court was situated, the city came into rectangular in shape, in most situation, the building of city walls have reserved space for urban expansion
Weiyang Palace, built in 200 BC, Han Dynasty
Chang'an, Tang Dynasty (618-907, AD)
http://upload.wikimedia.org/wikipedia/commons/1/16/(唐)長安_(당)장안_(Đường)Trường_An_(とう)ちょうあん.jpg
To get more information, please visit:
http://en.wikipedia.org/wiki/Tang_Dynasty#Chang.27an.2C_the_Tang_capital
(3) The house/palaces of the city graphic are too familiar with Japanese ones, the Chinese buildings inclined to be majestic, grand and breathtaking. Differ from the Japanese ones, the palaces were not sealed with white walls and boards but columns like the Greek temples instead (you know the most

), two storey buildings were common
(4)The city gate (or, the hole in the middle) was too big, city gates in all civilizations were buildings to observe people and pedestrians in and out from the city.
Here is the Shanhai Pass, despite it was built in Ming, I think that it was a good reference:
Thanks for reading and I have high expectancy to your creation, Kyriakos

