Anonymous
It is part of an Anna Risi portrait by Anselm Feuerbach in 1860,
He did a few portraits of her.
https://www.google.com/search?q=anselm+feuerbach++anna+Risi&tbm=isch&ved=2ahUKEwiw08ub68LsAhXACbcAHfsUBb4Q2-cCegQIABAA&oq=anselm+feuerbach++anna+Risi&gs_lcp=CgNpbWcQDFDXM1jGOWCVR2gAcAB4AIAB5wGIAdwFkgEFMC4yLjKYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=LauOX_CIDsCT3LUP-6mU8As&bih=969&biw=1920