Rosalba Carriera (1673/5-1757)
Italian portrait painter and miniaturist best known for her work in pastels
https://nmwa.org/explore/artist-profiles/rosalba-carriera

Gustavus Hamilton, Second Viscount Boyne, in Masquerade Costume / 1730–31 / Pastel on paper, laid down on canvas / 22 1/4”x16 7/8”

Susanna Drury (c.1698-c.1770)
Landscape painter, illustrator; best known for 2 gouache drawings of the Giant’s Causeway
https://vulcan.lindahall.org/16.shtml

A View of the Giant’s Causeway: East Prospect / 1740 / Gouache on vellum / dimensions?