It looks like the weight of the sword has snapped his arm at the elbow. The arm should be bent the other way, if anything. As for the hand, it will be hard to draw the fingers in at that size. Best to just indicate a thumb and draw the fingers as more or less a single mass. And right now the thumb seems to be incorrectly placed. The long section of the thumb, between the two knuckle-like joints, should be parallel to the sword's guard.