[1] [2] Millais is best known for his equestrian paintings and for his Spanish work, created when he accompanied Ernest Hemingway.

[3][4] Like his contemporary, Alfred Munnings, Millais was an opponent of Modernism in art, which he called "the Picasso lark".

[3] Numerous painted works by Millais have been sold at auction at Christie's,[5][6] and Bonhams[7] in London.

His oeuvre has been posthumously profiled in publications such as Artnet,[4] The Independent,[8] The Field,[9] and Art UK.

[15] After Elinor's death in 1953, Millais married his second wife Kay Prior Palmer with whom he had a third son, Hesketh Merlin.