I really, really like this. I've only a few minor crits.
The main thing that jumped out at me was the car (which, btw is looking phenomenal). The fact that it is foreground, though, and blends in so much with the background throws me a bit. I fell like it should pop more than it does, and could benefit from maybe the same outlining as the characters to give it more definition. The alley, as Meta|fox mentioned sticks out, too, but where it's (I'm a assuming) a WIP, that doesn't bug me.
The shadows on the side walk could be quite a bit darker. On the road, the shadow is almost black, but on the sidewalk it's near invisible.
The little details in this piece are great, especially the shards of glass. You'll be smashing up the windows on the far right, I presume? Anyway, great stuff.
Oh, and Welcome aboard!