Meaby its just me, but there seems to be an unbalance of detail, the face for example has a lot more detail than the arms, it kinda feels like you drew and refined the head before sketching the rest of the body, im saying this because the arms look pretty disproportionate when you compare them to each other, specifically the forearms, other than that i want to say that the eyes seem just a tiny bit more separated than they should be, specifically the eye on the right, the shading kinda does a pretty good job on hiding these flaws but you can see them after a few seconds of analyzing the piece, i have spoken.