PS: color to b&w, contrast/texture
Go from
to 
Pick your picture and crop and resize your base... it doesn't have to be a high-quality image (I'm using a picture I took myself with a run-of-the-mill digital camera), but it shouldn't be really low-quality, either (read: shouldn't be super grainy).
Sharpen twice (Filter ---> Sharpen ---> Sharpen), then use the Sharpen tool on any areas that still appear too blurry. I sharpened the clothing highlights, hair, eyes, and mouth. Be careful not to over sharpen, but if you do, use the Blur tool to rectify your mistake.
Let's brighten the picture up and make it more defined by adjusting brightness and contrast (Image ---> Adjustments ---> Brightness/Contrast). Every picture has different lighting, so you should adjust the picture as is appropriate to its lighting. For this one, I adjusted to about Brightness +18 and Contrast +15.
Now that the picture is sharpened and brightened up, go ahead and Desaturate it (Images ---> Adjustments ---> Desaturate, Or Shift+Ctrl+U).
It looks pretty washed out... not a very good black and white. Duplicate the base twice, and set the first layer to Soft Light 100%, and the second to Soft Light 60%.
Better. Let's add just a teeny bit of color... Create a new layer, fill with the brown/blue gradient below, and set to Soft Light 42%. Create another new layer, and do a dark blue exclusion layer set to 50% (fill with #010717, set to Exclusion 50%).
The contrast isn't up quite enough, so go back to Brightness/Contrast and turn up the Contrast to +10 (be careful not to turn it too high or your image will look way too washed out). Apply the light texture below (made by me from stock photography) and set to Screen 100%. Use a layer mask and gradient/paintbrush OR the eraser tool to erase the texture from covering the subject. Add some brushes and/or text effects, and you're done. Text used here: "S" in font Selfish at 30px with Outer Glow applied, and 2px Times New Roman at spacing/kerning 500 for tiny text.
