That's a really great looking portrait, I particularly like his facial expression. It looks very well done! But, I feel the urge to ask one thing, if you don't mind! What do those hands stand for that you seem to have sketched over the portrait? Or are those supposed to be a banner of some sort?
I think just the way you have presented him puts him in a place of power, whether through power. I think his expression but also his characterisation within the series is of course indicates how we perceive him, whether it be wealthy or intelligent. But I think you have indicated his intellect with the calculating expression that he wears... very good indeed