I'd suggest a shorter chain, and a less straight-out arm too.
At the moment he's not holding it up like "hahaha, I cut off this head, check it out you pathetic enemies!", it's a long way down, and at arm's length, more like "eww, a head! Keep it away."
Just a thought!
Dark Angels. The Rock. Lion El "Dwayne" Jonson. I can't be the first person to have thought of this.