I think the perspective is kind of bland, it works though. I think you're lines are to sharp, soften them some AA. It'll make them seem thousands times more realistic, also will help round out some objects.
I made some edits on some pieces to give you some ideas. Some some some.
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1. Tried showing you how things can look rounded. I obviously need practice.
2. Isn't my edit a bit closer to reality? A little less contrast on those pipe, probably too little but maybe somewhere in between yours and mine.
3. The bird is a bit neater and there's some volume on it. I'm under the assumption it was a 3D object and not something painted on the train. $
Play around with AA, it's a nice technique that really smooths things out.