A nitpic: although the angle of the blade looks great with his left arm, when looking at the sword/right hand, I'm wondering if there's room for improvement..
Have you thought about/tried positioning the sword perpendicular to the right lower arm, or even at a greater than 90deg angle? It might look more agressive. Also, although his great is skillfully drawn, a more clenched grip might match better with his facial expression.
Now I will get on my knees behind my computer and worship this image.
All great points VectorMancer, however I make it a habit to allow a piece to be "done" and not revisit it.
That being said, I take all input for improvement very seriously and will bear it in mind on other pieces. It is very kind of you to take the time out to help me improve.
Thank you for your excellent and professional observations.