The Yale Art Gallery says it has the portrait, but does not know the artist and that the portrait is not currently on display at the gallery. However, it also says that the image is available for public use, but does not specify the exact Creative Commons license. See https://artgallery.yale.edu/using-images. However, I do not have time to to email the gallery myself.
Wrth gysylltu rhyw waith â'r weithred gyfreithiol hon, mae'r person a'i gysylltodd wedi ei gyflwyno i'r parth cyhoeddus gan ildio pob hawl cyfraith hawlfraint arno yn fydeang, gan gynnwys pob hawl perthynol a chyfagos, hyd eithaf y gyfraith. Gallwch gopïo, addasu, dosbarthu a pherfformio'r gwaith, hyd yn oed at bwrpas masnachol, a hynny oll heb ofyn caniatad.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
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Mae'r ffeil hon yn cynnwys gwybodaeth ychwanegol, sydd mwy na thebyg wedi dod o'r camera digidol neu'r sganiwr a ddefnyddiwyd i greu'r ffeil neu ei digido. Os yw'r ffeil wedi ei cael ei newid ers ei chreu efallai nad yw'r manylion hyn yn dal i fod yn gywir.