you seem to have mashed a lot of different themes together into something I don't quite believe (also personal gripe, you've mixed the use of the fine orange and broad red bomb site signage).
IMO it kind of looks like you've mashed Assassin's creed, Witcher and FEAR together.
Regarding how busy the detailing looks, it's advisable to leave finer detail above the playable area to reduce visibility issues, but you've not left a single face without a prop or graffiti on it. It just feels very cluttered everywhere.
Following on from the detailing, your architecture: it's important for it to be believable and right now you have a lot of strangely angled buildings and unrealistic overhangs. Supports can make things feel more grounded, but the overhang still has to feel realistic. Do you have any reference photos?