Create a realistic and visually appealing cover for an online course module. The cover should feature a high-quality, photo-realistic image that subtly represents the diversity of real estate clients within the American Mortgage system. Focus on a modern real estate office environment with real estate professionals (agents, loan officers) engaged in various client consultations, reviewing documents, or interacting with different client profiles. Include subtle hints of client diversity, such as families, young professionals, retirees, and investors. Use a sophisticated color palette that conveys professionalism and opportunity, focusing on dark blue (Navy Blue), white, and gold. The style should be clean, realistic, and minimalistic, highlighting the client-agent interactions as the central theme. --ar 16:9  --s 750