Prompt
Create a realistic portrait of James M. Buchanan, an American economist and professor, sitting in a study with books and papers around him, looking thoughtful and introspective. He should be depicted wearing glasses and a suit, with a warm and gentle expression. In the background, a bookshelf with titles such as "The Calculus of Consent" and "The Limits of Liberty" should be visible. The overall style should be formal and academic, reflecting his profession and contributions to the field of economics.