I agree with *RedStar*. You did an excellent job, and you should fix that issue. Maybe if you add a floor texture, so we can see the wheels hiding some details. That way the impression of the wheels lying on ground will be better.
Very nice mate !!! I only have one small critic. Wall on left side.... if you look on spot/line where wall hit ground.... maybe just a small rotation on right in Photoshop and that all but thats almost nothing.... comparing with general look,skill and setup .... FANTASTIC !!! I think, FOR NOW, that we have a winner (my opinion)