Hey Lee, Great work, seeing it painted reminds me of a wang mask. For the veins, i used a pointed toothpic on my last mask, i just dipped it in ink and started drawing. If you do this, be sure to wipe off any excess ink so it doesn't bulb on the tip of the toothpic and blotch in the mouth. Hope this helps dude.
Great job on the painting dude. PEACE
KEITH