I mean that the muscles above the shoulder blades, that run from the back of the shoulder to the back/side of the neck should rise to their connecting point just below the skull in a straight line, with no bend. It wouldn’t feel that the head was as much placed on a much larger body, but that the small head was a natural development, despite the huge body size.
Again, don’t take this as any deep criticism at all, the modelling and anatomy other than that is quite good, and I really dig the style.