Here's a little bit of inspiration for ya. I know you're having a very speciffic subject matter at hand and probably millions of ideas for the fun part. Texturing. But perhaps this can inspire.

https://www.pingmag.jp/2006/04/13/10-...-tokyo-gotham/

If nothing else, it's cool HDR Photography
PS: Check out the large versions to see some of that lovely HDR coming into play.

Liking your project a lot.