I am starting PP on some Sulfur Crested Cockatoo portraits. The images are about half aunder exposed. I am using .dng files, and using the Adobe facility which is available within my PS Elements 11. In order to get good feather definition, I am increasing the positive value of sliders for White & Shadow, while increasing the negative value of the sliders for Highlight & Black. I appreciate that there will be no fixed formula, but am I headed in the right direction, or totally lost in the bush?