All public domain Birmingham Museums Trust images are now CC0. Birmingham UK, not USA. The Trust will still make a charge for use of files larger than 3MB at 300dpi. Currently the site is still offering small and low Web-res pictures, but the Trust states they… “will introduce a new Digital Asset Management System in late 2019”, when presumably we’ll get new buttons to access large files. Until then, I’m guessing that one has to manually email them to ask for a larger CC0 version.
Burne-Jones, sketch for Theseus and the Minotaur in the Labyrinth.