Prompt
                                        
                                            Generate a realistic portrait of David Seaborg, an American biologist, environmentalist, and author, in a style that reflects his profession and activism. Depict him in his mid-70s, with a gentle and concerned expression, wearing casual outdoor attire, surrounded by lush greenery or a rainforest environment, subtly hinting at his work with the World Rainforest Fund, which he founded. Incorporate a few symbolic elements that reflect his contributions to biology, environmentalism, and literature.