The Return of Persephone, Electra at the Tomb of Agamemnon, Perseus and Andromeda
Some other names (these all came from a Google search for Leighton)
Lawrence Alma-Tadema, Adolphe-William Bouguereau, J.A.D. Ingres, Gustav Klimt (name rings a bell), John Singer Sargent, John William Waterhouse
But, still no joy for the original search. It is somewhat frustrating to be able to picture in my mind the images I'm looking for, but not recall the name!