I simply love the shading here as well as the lighting and effect on the fist.
One thing that is off is the torso on both the guys is far too long, plus I feel that they both need a thiner waistline, yes guys don't have the same lovely curves a lady does but their bodies are not just straight lines.
I can see what you are doing in terms of shadow with the sword guy but at first glance it looked like the top half of his body above the sword was at the different angle to part below the sword, could have added more shadow from his coat on his left side below the sword.
Also the sword guy's eye line effect, can understand what you are going for just think it needs some fading at the end as though it is trailing off.
But on the whole it is a really good drawing with lots of detail and the metal tones are really good - still struggling with that myself.