Concerns with any bird may be pin feathers (feathers that are not fully developed) and the overall plumage of the bird. Another concern is shot or damaged feathers, some feathers may be fixed or repaired, such wing or tail feathers. Blood on feathers is not a concern or problem because birds are washed and blood/dirt comes out when soaked in a solution.
Getting a specimen that is fully feathered is essentail to a quality mount.