Really late to this challenge but I''ll take this time to finally start learning and exploring Unity. I spent a few hours thinking about what I wanted to do until finally deciding on lighting. Below you can view some examples and even more on a Pinterest board I created. The courtyard itself is a fairly simple environment with strong architectural elements. These inspiration images heavily depend on lighting and photographic composition to make them incredibly interesting to look at.
As a personal challenge, I deleted all the lighting, reflection probes, and additional meshes that were not part of the environment. I then noted a few camera angles that I'd like to work with and started exploring different lighting, sun, and skysphere settings. From there I came up with these two shots and I'll pick up tomorrow to explore additional angles and color combinations.