The hand holding the sword isn't bad, but I don't think it matches this pose. I'd have his hand more like one of these...
The sword in your picture also has a sorta weird shape. I dunno if you intended that, though.
The katana seems to be missing some important parts... Here's how I draw katanas:
Face looks good, but sorta off center. I'd shift it all over to the right more.
The pants have no zipper flap thing at the crotch... dunno if you didn't want one? The pants have no belt loops; if the pants are loose enough to need a belt, they'll probably slip past the belt after some movement and fall down.
Is that the seam (part where the pants are sewn together) on the pants? Or pockets? They don't seem to make much sense... And I dunno about your pants, but mine either have the seam on the inner side of the leg or on both the inner and outter sides of the legs. It can help give your drawing depth if you have them on the inner side, at least. With your picture, it looks like the seam is either on the back side or there is no seam.
The belt and cape look good. More specifically, I like the cape around the shoulder area. The anatomy seems pretty good overall, but the arm holding the sword should maybe be shifted over to the left a little.