The identification issue found for the last image was identified by Paul Frecker for this image, as described by their article: "The database at the National Portrait Gallery identifies the sitter as Lady Cornelia Henrietta Maria Spencer-Churchill, eldest daughter of the 7th Duke of Marlborough. However, since Lady Cornelia Spencer-Churchill was born in 1847, she would only have been 13 years old at the time the sitter in this portrait visited Silvy's studio.
The lady seen here is instead the Hon. Miss Lucy Caroline Spencer-Churchill, born at Ham in Surrey on 29 January 1832. Her father was Lord Charles Spencer-Churchill (1794-1840), second son of the 5th Duke of Marlborough. On 22 January 1880, she married Rev. John Fletcher Dixon Stewart.
She died on 28 September 1917..."
From Paul Frecker; sepia tone removed (and replaced in the border) and image size increased by half by gogm.