I have been looking at eagle references all day long and I am trying to decide if it is just the photography or if there really is tha much difference in the color of various eagle's beaks? Some are almost stark yellow while others run the gamust from light orange to a dark orange with light brown highlights. The reference I am currently working from has a medium orange beak with yellow highlights and some light brown/orange darker areas. So? What to do? Just go with my reference or try to correct it to more yellow?