I really like the model, it made me laugh when I looked at it. I have a heck of a time poly painting. I either get to much of one color, not enough of another, but practice makes perfect. From what I can see, you have a little to much blue on the jaw, and the red is a tad to much. Maybe if you go over the whole thing at maybe 3% RGB Intensity, with your base skin color it will cover the red and blue a little. I really like it though. Keep it up.
Things are a big monotone and there's not enough fine greain detail. Scott spencer's book gives a great breakdown on painting a face in multiple passes.
I agree with the comments about the overall redness being a bit much. Also, the first thing that hit me was it looks like there is someone reflected in the eye texture.
On the painting (please take these comments from someone who is a complete noob at it himself), there isn't enough fine detail as stated, perhaps using the cavity map feture to perhaps darken the dips and wrinkles in the skin.
I find that I can get nice results with a radially faded clouds fractal pattern in the Current Alpha slot; and using the Colour Spray stroke, with the brush set to Back Face Masking and Cavity Masking. With all these adjustments applied you can actually whack down colour at full 100% RGB intensity and still get nicely graduated transitions.
I uploaded my texturing brush to a thread here once. I'll have a look for it and get back to you.
Edit: Here you go! You might want to make your own 16bit alpha. I had to drop this one down to 8bit to be able to upload it here.