Derivatives
The Laughing Cavalier is used by McEwan's beer as its logo. It has been modified showing the Laughing Cavalier enjoying the beer.
In the Scarlet Pimpernel adventure series by Emma Orczy, The Laughing Cavalier is a prequel recounting the story of the supposed subject of the painting, who is an ancestor of her main hero, the Scarlet Pimpernel, Sir Percy Blakeney.
The "eyes following you round the room" trope has long been a stand-by in British comedy, used by Pete and Dud in The Art Gallery, among many others, sometimes in the form of a portrait with cut-away eyes that can be used as a peephole.
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