Jeffrey Smart, David Hockney, Chris O'Doherty (also known as Reg Mombassa), and Howard Arkley are all well-known and highly regarded artists who have made significant contributions to the world of art.

Jeffrey Smart was an Australian painter known for his surrealist-influenced urban landscapes. His work often featured stark, geometric compositions and bold, contrasting colors, and he was known for his ability to capture the essence of a cityscape with a few simple brushstrokes.

David Hockney is an English painter, draughtsman, printmaker, stage designer, and photographer. He is considered one of the most influential British artists of the 20th century, and his work ranges from colorful, abstract paintings to detailed, realistic portraits.

Chris O'Doherty, also known as Reg Mombassa, is an Australian artist, musician, and clothing designer. He is best known for his unique, surrealist-inspired artwork, which often features distorted, cartoon-like figures and strange, dreamlike environments.

Howard Arkley was an Australian painter known for his colorful, hyper-realistic depictions of suburban life. His work often featured mundane objects and scenes from everyday life, rendered in a highly detailed and photorealistic style.
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Overall, these artists are all known for their unique styles and contributions to the art world, and their work continues to inspire and influence artists around the world.