I like the expression - color abuse ^_^. Your point is very clear though, thanks for sharing links (may be I should check out more tutorials before making next pics...). I can definitely improve this one now. And no, no particular reference image. Made it in subway, actually :)

Banding is the main issue here, closely followed by color abuse ;)
It looks like 12 (at most) of these 34 are different enough to be told apart.

A bit more contrast could be nice. I like the overall light atmosphere but smoother pixelling could probably bring it out further.

Did you use a reference image? If so, it's good form to link it!

 That's very nice :]

Love the shading :D