Prompt
Create a realistic portrait of Sir Charles Lyell, a 19th-century British geologist and author, sitting in a study with a backdrop of books and geological specimens. He should be dressed in formal attire, including a suit and tie, with a thoughtful expression. Incorporate subtle hints of his work, such as a copy of "Principles of Geology" nearby or a geological map on the wall. The style should be reminiscent of Victorian-era portraiture, with attention to detail and a sense of dignity.