If you need high quality images for your papers, be sure to cite where you took your image from. Some reputable places to do so are the following databases, indexes, and reputable websites:
Japanese Digital Resources: Art: This page from the University of Pennsylvania identifies many websites for images. See in particular the section for databases of prints.
JSTOR Images (formerly Artstor)
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A digital library that provides access to thousands of digital images derived from a variety of museum, library and archival collections. Images support a variety of disciplines including architecture, painting, sculpture, photography, decorative arts, and design.