This image caught my eye immediately as I was looking through several deviations. First thing that caught my eye was that it was black & white. I like black & white mainly because of the level of contrast you can get with it. Which brings me to the second thing I like about this image was the contrast. The intricate areas of lights and darks are very intriguing. Also, I think the visual texture is extraordinary. The texture of his coat, his beard and his face gives your eyes something to hold onto, to keep you riveted to the image. As far as portraits go, your choice of model is as photogenic as any other. There's a lot of character in his face, a lot of history too. To quote a cliché "Oh the stories he could tell..." I didn't give you a perfect on originality only because there are quite a few pictures of this nature floating around but in my estimation, yours is one of the best.
I love this image, you have an excellent eye. That face really tells a story. Would you have any objection to me rendering this as a pencil/charcoal drawing and I'll send you a link when it's complete? of course, your work will be credited as the inspiration for the drawing.