Chang-su Houchins’s Artifacts of Diplomacy: Smithsonian Collections from Commodore Matthew Perry’s Japan Expedition (1853-1854)1 offers tantalizing glimpses into Japan and Ryukyu history in the mid-19th century. After downloading the PDF file, do a search on Naha, Ryukyu, and Ryukyuan to find items related specifically to the Ryukyu Kingdom. The illustrations of a “Loo Choo” woman and Ryukyu officials, below, are but two of many others in the book.
1 Smithsonian Contributions to Anthropology, Number 37, Smithsonian Institution Press: Washington, D.C., 1995. This is a large PDF so it may take a while to load into your reader.