Looking at the image, one can also see that San Fransico appears to have an influence on architecture here. Note the tall building on the left looks like the Transamerica pyramid.
As we see in Shindig, Persephone has a local monarchy. Nobility is indicated by wearing a sash.
In River's classroom scene in the movie "Serenity", Persephone is the sixth planet listed on the screen to the left of the teacher.