I have to agree with Black Orb that the perspective in the drawing is a bit wonky. It could just be that there's so little else in the picture to really give us a good sense, bu the picture has this feeling like the room is being viewed at an angle, while Gabranth seems to be sitting straight up with respect to the pictures borders. The perspective itself may be correct, but it looks strange to the eye.

That's just my take on it though. Other than that everything else is done extremely well.