Not too shabby. It's roughness and sketchy layout is your major strength as Brad mentioned. My advice for future cityscapes would be to explore and utilize perspective. There are tons of web resources that give the basic premise and approach to 1, 2, 3 & more point perspective. This will add a lot of dimension to what you have. It feels a little flat because the line work and much ofthe supporting city area is the same. Depth can be accheived by using thinner or thicker lines and darker or lighter values. Ususally the dark and thick lines and details are frontmost and they thin and lighten up as things go further back. The composition is strong and that has to do with repetition, especially with the clouds and how it breaks up the business of the city lines and shapes. Keep at it is all I can say and the more you try and experiment and practice, the better you will get.