Pretty cool, I liek the idea. Few c+c:

-The texture on the blue building doesnt line up very well at all.
-Roofs of the slums are too nice and square. They should probably have more rust and rough edges.
-There should be more fly swatters in the world (wait, thats my scenario. damn bugs.)
-The name, Dark Rain, gives off a fantasy feel instead of a GTA style game. I don't know the story yet but thats my take on it.
-(IMO) You shouldn't put a render up at this point... or at any point until your ready to show off the final version. Can we see that shot without renders?

+You've done nicely so far. I like the feel of it- the telephone wires, gritty look to buildings, etc.

Little more work there would make it superb! And i just got the fly with my oblivion owners manual! Woot!

Anyways, nice job so far, and keep it up.

EDIt: I just saw the second photo [heh] and all I can say to that is, the roof ought to have a little more overhang.
And the surb shouldn;t be so big.