The image you’ve shown does not display an actual artwork but rather a blank representation of a picture frame, so I’m unable to describe an artwork by Willem de Kooning or any other details related to an actual piece. However, based on the information provided, if there were an image of Willem de Kooning’s untitled artwork from 1950, it would be characteristic of the Abstract Expressionist movement, which is known for its abstract qualities. The piece is said to be part of a private collection.
Abstract Expressionism is an art movement that emerged in the United States after World War II and is often characterized by large, abstract, and energetically composed canvases. De Kooning was one of the key figures of this movement. His work from 1950 would likely feature his signature style of dynamic brushstrokes and a vivid, emotive use of color to convey a non-representational, or abstract, composition. Willem de Kooning’s abstract works from that time often blur the boundary between figure and ground, with organic shapes and forms interplaying with aggressive lines and textures. However, without the actual image of the artwork, no specific details about this piece can be provided.