Hi Nixie, I think it's all starting to come together. There are a couple of areas on the mesh that I personally would want to change if it were my model,but the most notable areas I feel is at the corners ofthe lips.
A lot of people model the corner of the lip so that it winds up running back up along the face towards the eyes or temple region. If you are planning on animating him, this might be an area of uncertanty when moving he mesh about.
A lot of tutorials tell you to do it this way,but I feel it is a bad design element.
So what I would suggest, rather than running that spline back up along the face up towards the eye, run it back towards the neck.
I don't have a really clear sample on the web, but a video on mysite has the wireframe showing.
here is the direct link.
http://www.3dartz.com/Video/VSamp5.mov
if you look you can see how the spline runs from the corner of the lip back towards the neck.
It's just a suggestion but I find that it is much much easier to do it this way. Not too mention it gives you a good split of the upper and lower areas of the jaw. Just to assist when creating morph targets.
If you want I could markup your image in Photoshop to make what I'm saying a little more clear.
Overall really really good.
Mike Fitz
www.3dartz.com