The Poisoned Cup (aka "Carrying a Peacock") by John Dawson-Watson, 1869
Another artist discovered via Pinterest.
John Dawson-Watson was a British Impressionist whose early work seems very similar to John Everett Millais of the Pre-Raphaelite Brotherhood fame. The rich colors and attention to detail found in this work becomes looser and more pastel after he studies Impressionism at Monet's home in Giverny.