You, sir, officially started what has been a dream project of mine for years. I had planned the exact same thing, with all characters in the stark black and white contrast the graphic novels were known for (except for the yellow bastards etc., of course).
I have to say that you perfectly captured the look of Marv and the Yellow Bastard!
The building I'd probably have done different, with white for the mortar between the bricks and the bricks painted black, and the glass of the windows white as well.
Next I'd like to see one of the vintage cars done in the same style, please

One cool thing to do would be to recreate the first scene from The Hard Goodbye where MNarv has to fight the riot cops and flee from the hotel. Foundry SWAT miniatures for the cops, World Works Games Apartment TLX terrain converted to pure b&w in photoshop for the scenery. .45 Adventure or Savage Worlds Showdown as skirmish rule system. It would be one of the coolest looking projects to hit the table.