"Unfortunately there are no artificial feathers, so yes, those are real feathers."
"These are all models, no real animals were used."
The way feathers are obtained is animals are slaughtered, then their feathers are plucked out. Wouldn't that mean that from a vegetarian's standpoint of whether killing of an animal was required to make your models, that real animals are used?
I might as well ask about the fur. Do you use real fur? Artificial fur is commonplace, but artificial fur resembling all animals is not available. I don't see much difference, in terms of harm to animals, between using real fur and using real feathers.