[-ash-]

I think you're getting there - though I'm not a C4D user either but here's some thoughts:

Try making the light like the sun early morning or late afternoon. In other words quite low in the sky. I've found that this gives more shadows that define an object and can bring out more detail. Move the light around to see which angle gives the best effect.

As well as rickei's suggestions I would also try lowering the camera to be more at the height of a person. At the moment there is no sense of scale so the buildings look a bit like models.