In addition i miss fog and city density.

Your city looks sparse and still too bright, Bladerunner is dark, dense neverending city - no horizion, just more buildings everywhere.

(+1 for fog)

greenish haze which progressively covers far buildings

also rain, and reflections on wet streets

also, add more acid greens

look at this unrelated pics

http://tinyurl.com/h4bgwfc

http://tinyurl.com/hkjavzo

http://tinyurl.com/j8gaehn

an see what they all have in common

I agree with the previous posts.

Additionally,
- It's missing some texture \ chaos (graffiti, cracks, billboards etc.)
- The buildings on the background need lights too, else they look like a district under blackout.
- I would change the lighting in some parts, like the roofs. I would also use less smooth gradients, replacing for sharper zones, though I didn't do that in the image below as it would take too much time.



Abuse (DOS, 1995) had some cool grunge visuals:

Thanks for the feedback and pictures, very useful to non-artist myself :)