Create a realistic and visually appealing cover for an online course module on the step-by-step process of buying real estate. The cover should feature a high-quality, photo-realistic image that subtly represents the concept of a step-by-step journey. Design the image to show elements like a winding staircase in a modern, elegant environment, a series of connected stepping stones leading forward, or a pathway marked with subtle milestones. Use visual cues like transitions from one stage to the next, subtly suggesting progress. Use a sophisticated color palette that conveys professionalism and guidance, focusing on dark blue (Navy Blue), white, and gold. The style should be clean, minimalistic, and slightly abstract, with no text or titles included in the image. --ar 16:9  --s 750