At the moment I'm focusing on Dorian's Office, since it's the most personal of the sets. It has to be the most cliche, typifying noir detectives office possible; slit blinds, solid desk, drinks and mess.
Here are a few sources of inspiration:
The style is drawn from Lyn-Dae work, bold lines and forms with finer detail within. Dorian imagines himself as a straight, upright figure of the law, as such his office reflects that, being full of square, straight shapes and lines. However, the concentric shapes and mess show flaws and cracks within this vision.
Another view of Dorian's office...