Been workin on this for the last day or three when I'm bored.
Here's a disection of the progress thus far
Basic shape to serve as a background for the rest of the work:
Basic shading of the body:
Basic highlights added:
Doorlines and detailed shading for reflection added:
Detail highlights added on the body.
Using Color Overlay to add color to the layers.
Starting on the windows, using a base grey for the pillars and surround.
Adding in the glass and minor shading adjustment for the buildings in the reflection.
Shading for the reflections in the glass and details of the pillars and surround.
highlights on the pillars and surround.
.. and that's where I stand as of now.