I like the shinning intense eyes, but the mouth looks a bit relaxed for the expression, I'm sorta confused if I look from the nose up I get uneasy and from the nose down I feel almost comforted. The light and dark texture around the outside almost give the impression of a long Fu Manchu beard. Kinda an angry caveman meets Lao-Tzu.
Something like that (at first I thought you where reffering to me and I was about to get all insulted, then I realised you meant the picture. Not that it would have been an entirely incorrect description of myself, you'd just need to drop the wisdom part)