The artist lets us see everything in this etching – how he works and how he lives. In fact, art and life are gloriously inseparable for Rembrandt. He is sitting happily at home with his wife, Saskia, their mutual contentment cosily apparent. His shadowed face and drawing hand contemplate their combined image in a mirror that reveals art not as a remote formal activity, but as a part of life.
[https://www.theguardian.com/artanddesign/jonathanjonesblog/2014/sep/04/the-top-10-self-portraits-in-art-lucian-freud-sherman-rembrandt]