Wow, you sure set yourself up with some challenging lighting! Flash mixed with two kinds of fluorescents, from the look of things, and no colored gel on the flash! Thus you've got yellow hair highlights in white hair, an overall pale cast, and greenish concrete.
Never fear, the color can be fixed, and a more "gritty" conversion to black and white is in order.
The one other thing that jumps out at me is that the floor looks a bit crooked, since the line where the floor meets the wall is not parallel to the bottom of the image.
This also can be fixed, with the Crop tool and Perspective feature enabled.
How do these edits look to you? Hopefully they can give you some ideas for direction.
All work done in Photoshop on a 400% upsample done with Genuine Fractals, then downsampled in the end and sharpened a bit.
For the color corrections, first I made the man look more healthy, then selected the floor and wall, leaving the man out of the selection, as he's mostly lit by flash. I used the Curves "Gray Point Dropper" function and sampled the concrete, which brought the floor color in line. Then I selected the inside of the store and used Curves and sampled the desk, which removed just a bit more yellow. I used my Local Contrast Enhancement with High Pass Filter action (from my dSLR Tools set) to increase the contrast a bit. Finally I cropped the image using the perspective crop tool and raised the bottom right corner point some.
For the black and white conversion I used an action I developed a long time ago. I was once going to sell this set; one day I may still. Basically it employs even more high pass filtering to raise the contrast of edges. I had to back the effect down in the man's pants and on the wall poster with the store's name, as they became too contrasty.
-Noel
Linear Mode
