I love this piece! The fine details are so very well done!! But..
A hood doth not an assassin maketh thee.
That's the only physical difference I see between him, the dead dudes on the floor (are they dead? there's no blood, wounds, or even damage to their armor to show they've been harmed), and the lousy guards in the back, who's defensive stances suggest that the man in the hood should be heading towards them, but in my opinion (I would be running away if I were one of them) I would have drawn them as advancing towards the man in the hood, as if to pursue him (and at the rate he's walking he wouldn't be difficult to catch).
The guy in the hood comes off as a total badass, which is fine to do with assassin-type/lone-wolf characters, but he seems as if he's too good for the scenario he's in, so to my eye it kinda downplays his coolness, because he's not worried in the least, almost as if he's not even serious about being an assassin. For me, an assassin character can be as silly as he wants off the job, for example Ed Kenway, but on the assassination job, even Ed swaps his cunning smile for a grim mask. This guy's face, compounded with the situation he's in, reminds me of Starkiller from The Force Unleashed; an OP wildcard who kills because he can, or because he was told to.
I really do like the piece, and I find it amazing, but I just gotta put this out there. Good work on this one