I’m sure you have witnessed those situations, where people wanting to take a portrait of someone else place their subject to have the sun shining directly onto them. Because it looks nice. Objects look sharp, crisp and colorful when the sun shines on them. That’s definitely valid for landscapes, buildings and stationary things. It’s less favorable for human beings. Because they tend to squint when facing the sun, and you get unfavorable shadows in their eye sockets, especially when the sun is high.