I also think it should be a general bird of prey :3 you could customize it's beak length, cheek size, beak curve, forehead size, crown feather size, eye size, weight(fluffyness), and then width length and height
then the tail feathers could be customizeable, then mane/feathers, head feathers, and tufts like on the back of the head, neck, back of legs, or back, and then eyes, and head, body, and tail markings. The beak would switch out the nose color, and there can be pelt, underfeathers, eyes above eyes and below, contour feather tips(instead of tail tip), mane/tufts, and markings ^_^ the markings could include different patterns that many interesting eagle, falcon and hawk species have