Good and evil is judge by the different point of view. It will totally change the whole judgment of the story, depend on what side you choose to believe.
I notice woman's bra drawer is open. Maybe that means someone - possibly a crazed and perverted stalker - was in her room. With her attire, the idea certainly wouldn't seem too far-fetched. She could have finally snapped and decided to rid the man from her life, and is now wondering what to do with the body. However, her lack of remorse or fear of her actions leads me to believe she might have enjoyed it a little.
Well drawn and see the artist has gone ut of his way to make this provotive but her expressions give away who she is, possibly the murderer. A feared expression could mean either way but to be stone cold in look after killing and with blood with no remorse shows a woman with intent.