Image credit The Great Cat, here. Patrick Steen's Cat on a Radiator, David Hockney; date, medium, size, and holder unknown.
Now this is a mystery image. I found it only on the site The Great Cat, attributed to David Hockney, yet a thorough search of the web reveals no other information about the existence of this image. So it might not even be a Hockney work.
So let's just focus on the image. Although my reading tells me that British artist Hockney was much more of a dog person, he really captures the essence of a blissful cat sleeping. Perched up off the floor, totally relaxed, paw dangling, warmed from below (cats are true connoisseurs of heat), what strikes me most is the kitty's facial expression.
The cat just looks happy, and Hockney nails it so well.