People tend to forget that raising your arms isn't just a matter of rotating that ball-socket joint at the scapula. After that initial rotation, guess what comes into play? You can do it! The clavical and scapula bones. There's that large muscle to either side of your neck which facilitates movement of the collar/scapula bones. It is the Trapezius muscle. This is what allows you to raise your hands above your head. Although using a mirror (or photographs) is a good way to see how a body really poses, you should also have anatomic references ("Human Anatomy for Artists" is highly recommended) to see what bones, muscles, and tendons are involved.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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