Ah, always two sides of the same coin... The transition from one side to the other is almost flawless in its design. Not sure about the inclusion of breasts though, maybe makes it too gender specific? Eh, what am I saying anyway? This piece is hauntingly brilliant.
Excellent image, but unrealistic. Humans have the duality of good and evil. (Imperfection) Angels are completely good or completely evil. The good ones are free to change, and if they do, the completely good becomes completely evil. All angels are originally created good.