I've just spent a few minutes just looking at this painting, it's got something special. Her expression, the snakes, the color scheme, and most specially the beheaded statue just behind her... Is that his head she's holding ? the expression on that face seems serene, whereas the body behind is still trying to escape. Did he find some sort of peace whe he looked upon her face, on the instant that he died ?
I've no idea what Theros is, I'm going to look it up now.