Portrait of John, Lord Mountstuart, later 4th Earl and 1st Marquess of Bute Jean-Étienne Liotard, 1763
Head of Saint Francis (recto); Studies of the Head of Saint Francis, Head of an Old Man, and Two Right Hands (verso) Bernardo Strozzi, about 1610-1620
Head of Saint John the Evangelist: Study for the Disputation on the Immaculate Conception Giovanni Antonio Sogliani, 1531/36
Thomas Pennant. Stipple engraving by W. Ridley, 1793, after T. Gainsborough, 1776 Thomas Gainsborough
Sir John Frederick William Herschel. Stipple engraving by D. J. Pound, 1862, after J. Mayall John Jabez Edwin Mayall