I like it!
It's very evocative, instantly conjuring up the feeling of a run-down, rusty dystopian world.
Reviews for "Rust: The Slums"
A professional example of concept art.
But ugly to be honest. May not be your fault if it's just your job to realise somebody else's designs though. Composition wise you haven't done anything wrong, you've followed the rules; but still not particularly striking. again, it may have been difficult to to effectively translate these designs. I'm talking mainly about the top one, the bottom is better i think.