Hi everyone,
I’ve been studying about facial muscle and I made this model.
Please crits and comments are welcome
Alan 
Its a very impressive looking head. His forehead is a bit too high. The mentalis muscle (chin) should be pushed upward a tad bit. And be slightly pincushioned. The muscle fibers insert into the skin and you would see the little dimples of the attachments in this pose. The upper mouth looks a little wierd, the muscle of the lips are pretty smooth. And the muscles that connect the lips to the cheek are not visible on the sin (well the attachments are not). Is this supposed to be a muscle study or an old man study though? If its a muscle study I would suggest either really gaunt face or no skin at all.
youve got some good wrinkles under the eys and op the forehead but the wrinkly skin effect you are trying looks too bumpy , it has to be more ‘fine’ and smoothed out…but good wo rk so far alan.
womball Hi, I agree with you about your observations, I’ll fix it. Really thanks.
eddski Yes, I agree too. This work I’ve made roday afternoon, then I’ve a lot thing to fix, i’ll fix it in the next up. Thanks dude
ok, another angle!!
http://www.zbrushcentral.com/zbc/showthread.php?t=026463
if you still didnt saw this, you schould 
for a head muscle study, it looks like yopu didnt use any references 
There are many ppl making funny faces on google, bet they will realy help in this study :]