Does he have a cowl on ? his pectorals should tie into his shoulder muscles at least if you follow the standard anatomy for bipedals. Also though it is theoretically possible to have no armpits it is a little strange. His palms also seem a little strange but that may just be the angle.
A great resource for anatomy: http://www.bartleby.com/107/
Be warned though the muscle structures are mostly scientific and not completely ideal to translate to artistry directly, but it does present proper connections.
Also check out cgtalk for some good examples of muscle studies and such: http://www.cgtalk.com/
Be warned long exposure to cgtalk as an amateur modeler can cause severe depression.
Just wanted to say I didn't mean to be all negative with the post, the face looks pretty good and I like the profile of the character. overall it's a good start.
I worked on some the suggestions you gave me, and I really wasnt happy with the head so im reworking some of it. havent worked on it much lately though.
You might want to lower the angle at which the arms stick out to around 45 degrees. It'll cut down on texture deformation in-game.
Also, the arms look a bit tacked-on, IMO
The torso is fine, and the arms are fine, but they aren't really connected. That's mostly a result of the 45 degree thing though.