David Hockney - Mr and Mrs Clark and Percy (1970/1971)

Currently located at the Tate Gallery, London.

(For more information visit: http://www.tate.org.uk/art/artworks/hockney-mr-and-mrs-clark-and-percy-t01269)

Andy Warhol - Marilyn Diptych (1962)

Currently located at the Tate Gallery, London.

(For more information visit: http://www.tate.org.uk/art/artworks/warhol-marilyn-diptych-t03093)

Rembrandt Harmenszoon van Rijn - A Man Seated Reading at a Table in a Lofty Room (c.1628-30)

Currently located at the National Gallery, London,
(For more information visit: http://www.nationalgallery.org.uk/paintings/follower-of-rembrandt-a-man-seated-reading-at-a-table-in-a-lofty-room)

Rembrandt Harmenszoon van Rijn - A Man Seated Reading at a Table in a Lofty Room (c.1628-30)

Currently located at the National Gallery, London,

(For more information visit: http://www.nationalgallery.org.uk/paintings/follower-of-rembrandt-a-man-seated-reading-at-a-table-in-a-lofty-room)

John Constable - The Hay Wain (1821)

Currently located at the Victoria and Albert Museum, London.

(For more information visit: http://collections.vam.ac.uk/item/O81405/full-scale-study-for-the-oil-painting-constable-john-ra/)

Bartholomew Colles Watkins -  Ruins on Holy Island (1863)

Currently located within the art gallery of the Ulster Museum, Belfast.

Sir John Lavery - Spring

(Date and location unknown)

Gustav Klimt -  Portrait of Adele Bloch-Bauer I (1907)

Currently located at the Neue Galerie, New York.

Gustave Doré - Illustration 11 of Edgar Allan Poe’s The Raven (1884)

René Magritte - The Lovers (1928)

Currently located at the Museum of Modern Art, New York.

William Holman Hunt - Our English Coasts (Strayed Sheep) (1852)

Currently located at the Tate Gallery, London. 

(For more information visit: http://www.tate.org.uk/art/artworks/hunt-our-english-coasts-1852-strayed-sheep-n05665/text-summary)