Link to the Image Source
Guildhall Library and Guildhall Art Gallery

Artwork Details 

Title: Charles Cornwallis, First Marquis of Cornwallis
Dated: ca. 1792
Medium: Oil
Dimensions: 57 x 45 in. (cm. 144.8 x 114.3)
Location: Guildhall Library and Guildhall Art Gallery
City, State: London
Country: UK