Thanks for the advice Sentura. I agree there's some problems with the street and it's lacking atmosphere. I'll continue to refine the 3d skybox and attempt to add some more depth.
Hopefully the atmosphere improves once the cars, bins, phone booth and other street furniture are textured. I think building signage and billboards will also make a dramatic difference.
Something else I'm concerned about is the difference between the look of the interior and exterior areas. I like where both are heading individually but not sure they're working well together.