|Greetings from the Critique Club!
I can see, as I trust the voters can, that you shot this at a 3/4 angle to the bus. Thus the angles are kind of all over the place; I find that DPC voters tend to not like off-kilter horizons, and here I am looking for a horizon to stabilize myself, as it were, but can see none. I thought it might have been shot with a wide angle lens initially due to the almost cartoony distortion of the front of the bus in particular. I know I find the apparent downward tilt of the front of the bus - I know, it's perspective - but it seems to give the photo a top-heavy quality to the right of the pic.
As for the PS tricks, I actually don't mind them here. I don't think it's overprocessed, but seeing that you shot at ISO 1600 and image noise always seems to Nikon's main bugaboo, I can see some noise; otherwise I have no problems with slow shutter speeds to create ghost trails behind moving subjects.
Hope this has been helpful and feel free to PM me with any questions.