The verso sketches may be thumbnail sketches for paintings, possibly "Wedded" (c. 1881-82, Art Gallery of New South Wales, Sydney) and "Clytemnestra" (c. 1874, Leighton House Museum).
Frederic Leighton
Frederic Leighton, 1864
Frederic Leighton, 1865
Frederic Leighton, 1877
Frederic Leighton, 1886