Hey Mike, Looking great!
 
 Something about the upper arm, seems a tad off  - too short compared to the forearm or is it the back muscles [dorsals] that come out too wide?   Perhaps they are overly developed compared to the rest of the body?   The dorsals could be a tad too highly  and forwardly placed  too  thus not allowing  it to form the edge that hollows the arm pit. It would be good to see the arms  raised more to see the armpits.

That area is the only trouble spots I see in forming.  I suppose shoulder blades would be really hard  to model in the confines of so few polys especially since they change positions and shapes with arm movement so much.

The rest seems just superb to me, so glad you are so close to finishing it.  With your excellent rigging this would be a very special figure  I wold love to have.:)

Cheers to you  :)