the katana looks pretty cool, looks like the hilt needs a bit of work before it looks like the hilt of a katana

i think the biceps are placed in a bizzare position
i tried putting my arms in that position and i'm fairly certain (unless i'm not built properly) the biceps don't connect to the shoulders on top when the forearm is facing that way.
if you change the biceps so that they are facing forward and connect between the flat part of the forearm (i don't know body part names) and under the shoulder it should look better
unless that was done on purpose.. in which case carry on