Here is Buquet's description, quoted from the book:
"He is extraordinarily thin and his dress-coat hangs on a skeleton frame. His eyes are so deep that you can hardly see the fixed pupils. You just see two big black holes, as in a dead man's skull. His skin, which is stretched across his bones like a drumhead, is not white, but a nasty yellow. His nose is so little worth talking about that you can't see it side-face; and the absence of that nose is a horrible thing to look at. All the hair he has is three or four long dark locks on his forehead and behind his ears."