By the Sword in my Hand...

Hey there, I figured I might try and give you that critique you wanted. Everything I say is just my opinion, though and you should feel free to ignore it.
Let's begin with your body language . Because of how your character's head is tilted toward the right, it gives her/him a curious vibe. Based off your title, I'm guessing that this isn't the emotion you wanted to convey (if it is then just ignore this paragraph). To resolve this difficulty the easiest thing to do is to straighten his/her head so that it's not cocked at such an angle. The more complicated solution is to have his/her neck arch backward a little so that he/she is looking down her nose at the victim, maybe while wearing a faint sneer. The sense of disdain these change would invoke should increase your character's sense of superiority as well as dispatching that pesky curiosity he currently has.
Let's deal with the figure construction next. Your foreshortening is powerful and well done, but the form underneath is a little weak. After getting past your left hand, much of the form fades away so that it looks like we're starting down a pipe rather than someone's arm. ( This smooth, featureless style might be the style you wanted for this piece and if that's the case just ignore me). Something to remember is that swords are heavy weapons (especially European medieval ones) so the muscles should be bulging outward more, doubly so since your character isn't using his/her biceps (this has to do with how he/she is holding the sword). In short, I suggest adding a stronger sense of overlapping muscles to the arm, especially with those of the forearm and shoulder. On a second note ( this might just be my personal preference) I feel that your left hand is tilted a little too much, I think we should see a little more of the back of the hand. Alright, we're almost done with the figure construction and this last one is really quick. I believe your collar bones are placed a little high. Right now they seem to share the same horizontal as the shoulder when the should actually start below it and curve up into it ( this might just be the foreshortening. Fantastic job on the sword BTW)
I'll be looking into your composition next. Because much of his /her body is concealed behind the sword the character has a rather wooden posture. This kinda works with the picture so only change it if you like my suggestion. Now what I might do is make the pose much more extreme. Cave the upper torso forward and shift it to the far left of the canvas and then lift his left should so that you can really exaggerate the downward tilt of the blade. Next I might shift his waist to the far right and have it face upward. With this we'd have a powerful curving motion that starts high (with the torso/back curving to the left) before curving down with the spine and eventually shifting direction with how the hips and upper thighs curve toward the upper right.
Whelp, that's all I got for you. I Hope this helps in some small way, if only to jog some ideas of your own.
Fair fortune and may you never stumble into a litch's lair.