Constructive Criticism

Hi all, I've submitted a couple images to recent Critique the Community posts, but this is my first foray into the discussion boards. I'd love to get some criticism on this portrtait of a Sadhu (Hindu holy man) taken in Nepal. I'm not generally a portrait photographer, and this is obviously not as refined as a studio shot, but I think (hope?) that lends it some level of authenticity and works for this particular subject.

I'm happy with the final photo, but also interested in suggestions for post processing. I'm still pretty new to LR and PS, and even newer to using them for portraiture.