Anyway, here's the answer:
John Singer Sargent (1856 – 1925)
Madame X (Madame Pierre Gautreau), 1884
Oil on canvas
Metropolitan Museum of Art, New York, N.Y.
The icon also serves a sort of a visual pun. I first used it for last Sunday's art post, which you'll recall was a series of photographs of Baltimore. Since that post was a combination of a list of ten things and a Sunday art post, it was only appropriate to use Madame X as the icon. Haw! I kill me.