Do not stand like a cadet, you got curves girl, flaunt em and if not then create them. Changing your standing posture can dramatically bring in hidden details. And never ever let those arms left hanging, I repeat, NEVER.
That means your knees, ankle, arms, wrists and every other freaking joint. Bends introduce curves and dynamics of the anatomy to the picture. But too much, and you will end up making awkward angles and poses.