This image shows photographs on the fireplace mantle in Katherine Mackay's (Katherine Alexandra Duer (US1797spouse1)) bedroom. The website that posted this image (see below) describes it this way:
"Clareie and Kitty."
Note: "Clareie" appears to be a typographical error for "Clarie."
Note as well: these photographs can be seen at the left end of the fireplace mantle in this image.
See Harbor Hill, Clarence Hungerford Mackay's Mansion.