Honestly man, I think you’re not listening and are more passionate and hungry to reach a result than calm and analytical about what you need to do.
You just restarted. But went with the same murky picture. Can you not take a clearer one? Or choose another one? Choose a good reference to help yourself.
I have not done any city scapes before but here is what my eye is catching. This follows with what Lunatique said. If you don’t study the foundation you will not be able to see them. You need to study each one individually first before you can put it all together.
1- Aerial perspective and edges: Regarding the background buildings, in the reference picture I can see three levels of: color saturation and edge definition. first building in the background has clearer edges than than bunch in the back. the Bunch in the back has clearer edges than than the furthest one back. Same goes for color saturation, as we go back there is more color loss moving to grey. Also its not just fading the edges and losing color. There is some grain or noise needed to make it look more realistic. Your painting has none of that. Also you gave two of the background buildings a strong color. Red and blue man? These color are too strong and so our attention goes there instead of the street and it is not like that in the reference picture.
2- The street has no texture at all, also it is straight instead of sloped so the view is too symmetrical and boring. When the street has no texture it means I cannot sense the depth as it goes into the distance. Also it is the same color from the front to the back. Also I cannot feel the pavement rising from the street on the left and there is no pavement on the right at all.
3- The buildings on the right are all same color and boring. Actually where are the cars? The people? The trees? The electrical poles? The city looks empty.
4- Going back to the buildings on the left, the furthest building has the same edge and color saturation as the closest building. That is another chance to show us depth.
5- Perspective wise: your painting suffers from perspective distortion. Meaning your angle of view is too wide.
http://en.wikipedia.org/wiki/Perspective_distortion_(photography)
6- Crop the sky, your are showing too much sky with nothing happening in it.
So I hope this clarifies things and gives you some stuff to work on and things to go read about. My personal experience in drawing and painting has been that you will need a long time to finish your first real painting, the rest of them happen quickly though because it is the same foundation. We study for a long time to make one piece of work, but then those skills will help us in all the others and things will start happening faster. So develop your eye, keep reading, learning and drawing.
Sorry for the long post and let us know how it goes.