Very minor crit, but in the scenes when he's drawing the sword, he's holding the scabbard (saya in Japanese) upside down. A katana is carried and drawn with the cutting edge up. It's also exceptionally unlikely that he'd draw with his left hand; traditionally, even lefties carry the sword on their left side and draw/fight…
looks nice man i think a light fabric overlay on the normals of his shirt could do wonders for it if i had to lay a crit on it, the face is a bit long, but some people have long faces so not really an issue. i like what you have done with the hand guard on his left hand.