Man-Made Monster

Character design for a body snatcher type alien monster. An homage to famous aliens like the Xenomorph Alien, and The Thing. 

The concept is that instead of an alien hatching from an impregnated host, it instead transforms the host itself, loosely mimicking its physiology and bodily functions. 
In this case a man has been transformed. His arms has become powerful hind legs with which the creature can pounce at its victims. The (human) legs and feet are now used for grappling and holding a victim by the shoulders, allowing for the (former) penis, now an egg laying tube to pierce the soft area at the base of the throat, between the clavicles and plant an embryo.