Glance Over Shoulder

Fairly subtle, but I like it.

Girl with Skull

I think David Gluck owns this.

Foreshortened and Reclined

Difficult to pull off well, but I think this one works.

Power in the Thighs

Gluteus medius and maximus, biceps femoris and quadriceps move together to pack a punch.

Ribcage Madness

I love me some protruding ribcages.  The scapula is good fun too.