In this carving, the head is the 'pinch point': what the piece is really all about. So go carefully as you find the form that underlies: the forehead, knobby bit that leads into the bill (actually called the 'knob') and the cheeks, and work down to the bill itself. As you peel back wood to create the bill, be aware of its shape and how its tip will touch to back feathers.
Notice the way I use the corner of the gouge to shave back the forehead. You can really only do this across the grain.