Hi, i just finished yesterday this exercise. The open mouth definetly made this shark a lot harder.
I agree about the nose, it has an arc upwards from the top hat puts it at eyebrow level on the design. Also the lower jaw ends with more of an angle downward towards the body, and the teeth on the front of the upper jaw are huge on the design but small in your shark. maybe that would change the feeling of it in the front view. Also, looking from the side, I think the eyebrow on the design is bigger from behind the eyes, if that makes sense.
I hope that helps
