I think you have chose a very challenging subject to do...

Right now, the image looks like an abstracted representation, if that is what you are after, then would recommend mainly using more lights - instead of lighting the scene in a more or less global fashion, you could array extra lights close to the tiers to bring them more to one's attention.

If you are after a more or less "realistic" presentation, then the tiers being hard edged stands out, in comparison to the bank on the left. Don't know your preferred methods, but might experiment using latices as terrains, overlaping them into the already present terrains to break up the edges... texturing them to match what you use.

Haven't ever been to the locale, so don't know what the texture is like, but at present it looks in the image like a very hard, and smooth stone.

One idea, is to use lights, as mentioned above, but not just with the default white color, but adding some variety, going towards the orange/yellow end to warm up the texures and towards the bluer end of the spectrum to cool down that area.

Depends on the direction you wish to go. Abstract or photoreal.

Just some ideas.
best, hewsan