The shape of this blue parrot mask screams Hyacinth, with its exaggerated overbite and light coloring around the eye. But that eye ring should be yellow, and a Hyacinth would also have yellow at the base of the beak. A Spix's Macaw is blue, too, but the shade is different, and in that case this mask would be missing a lot of white around the face. So this is a non-species "blue macaw mask" which is a fine look for Halloween. Wear this with whatever you want because you're making up your own species at this point. Rainbow tutu? Zebra-striped tuxedo? Go for it.
Or, you could add a DIY element, get some white or yellow paint, and commit to a species. Both are endangered (Hyacinth is Vulnerable and Spix's is unfortunately extinct in the wild) and dressing up as a specific species is a great way to spread awareness. You can inspire conservation when you go out trick-or-treating! Whatever your species, you'll most likely be on the hunt for seeds and fruits.