I quite like your coloring (what did you have in mind when you said 'more traditional? Sumi-e style for the fuedal theme, or just more blending of the colors?) I'm impressed how good the shading looks, even with all the pen strokes are distinguishable, the mask look very 3-d. like all the colors and strokes in his hair.

I also like your use of negative space, I think it's neat how he's only in the corner.