I agree about the shoulders, they appear to droop too far. Furthermore, neck and shoulder muscles should be flexing when the shoulders go up again. When the red element flickers out of the nose, try sliding the head down on the neck, and bringing the head back up with the upward shoulder motion.
On the second animation, the third head position doesnt match the face in the other frames.
These should be cool when done. Edit these, and lets take a look again!