Create a highly realistic, photo-style cover for an online course module titled 'Follow Up with Clients.' The focus of the image should be a modern smartphone or office phone placed prominently on a sleek desk, symbolizing communication and follow-up. Surround the phone with subtle elements like a notepad, pen, and coffee cup, suggesting a productive work environment. Use natural lighting to give the scene a warm, professional feel, with hints of activity in the background. The color palette should include neutral tones with accents of blue, gold, and white to convey trust and professionalism. No text should be included. --ar 16:9  --s 750