Astonishing work; I agree with the poster that said you should send a portfolio to Wizards of the Coast- this is exactly the caliber art you'd expect to see on a Magic: The Gathering card.
In general, though, this piece is really wicked. I love your realistic style even with a fantasy piece, not to mention the creepy pose that really conveys a strong sense of eeriness.
Oh and, I don't know if anyone else noticed it, but the semi-hidden skull in the fog near the bottom-right cross is a nice touch.
Top notch work, following your stuff undoubtedly.