It’s possible you have too much light. Here’s a list of a few options:
- Go to Environment, select the dropdown under natural lighting, turn down sun intensity to 0-50, and ambient to 1.00.
- Go to Camera, Exposure and WB dropdown, change highlight reduction to 1.00, shadow boost to 0.00.
- Under Render (if using lumen) turn scene detail to 4.0, Reflection setting quality to 10.0, bounce count 2.0. Shadows 10m, Shadow bias low (0.25).
Let me know if that doesn’t resolve anything.