Anatomy criticism:
* The medial head of the triceps is oddly, like "unfinished clay stroke" towards the common tendon of the triceps. Should be a full, round piece of muscle, like other heads.
* Ulna isn't completely straight from the elbow to the wrist, from the posterior view. There's a slight angle upwards on the area where the anconeus muscle sits. Look from references.
* Adductors and hamstrings is usually a single "smooth" form on the back of the thigh
* Same "smooth" form applies to flexors of the forearm as well, exept the pronator teres which is right on your sculpt
* Seems like he is missing the tibialis anterior muscle from the front (anterior, and a bit lateral) side of the shin, ...and when you add it, remember that it turns into visible tendon towards the foot and inserts to the medial side of the foot.
* Also, the tendon of the extensor digitorum longus on the foot area is missing
A good quick reference for the lower leg:
http://4.bp.blogspot.com/-GhvxfnH0DT...hotoLABELS.jpg