Filters in Photoshop. Imagenomic's Portriature and a diffused B&W filter in Tiffen's Dfx. It's probably possible to replicate it without those though. Convert to B&W, Diffuse Glow, then add some kind of blur. Haven't tried that though.
I wanted to see this with a warm B&W. I used a "Chocolate Syrup" PS Actions and some painted in light and dark. Amber Kubota Image Tools team
better late than never: cropped, copied left eye to right eye, heal and clone on imperfections. highpass to sharpen, Gaussian blur on skin-lowered opacity and off set with highpass layer. slight vignette. oh and I straightened it too Im still learning....