I checked some details on the painting. I think the hands of the lady, see below, are rather bad reproduced, not so anatomic. Also, the way she holds the mirror seen's rather unnatural. I am unexperienced in judging art but my conclusion must be that the artist is rather poor and hence probably unknown. Another opinion someone?
What clues could the ladys clothing gives regarding time era and the abode of the artist?
Best regards,
HoDaK