Thanks for the constructive comments.
I edited the link to fix it. I also changed it to a slightly diffeent version.
The posterization was my fault. It came from the Levels adjustment layer with Overlay blend. I dropped the Opacity to 25%. That reduced the posterization along the left wall. Same with the noise.
This version also has Lens Correction applied to improve the prespective.
There are lots of ways to make a contrast mask. This photo had such dark tones, it took only a few stabs with the Magic Wand to get a candidate selection and just a couple of brush strokes to clean it up.
Cheers,
Mitch