John Singer Sargent [1856-1925] American painter. - Oil on canvas.
Madame Subercaseaux twenty years old at the time, was the newlywed wife (married 1879) of the Chilean consul to Paris Ramón Subercaseaux [1854-1937].
The following is from her diary.
"…His way of painting was light, as his work showed afterwards. He concentrated on each detail and took great care of the effect of each object and colour. He was a man of great skill who felt secure and at ease while working…"