Exploring Materials & Rendering in Blender - My Practice

I’d really appreciate any advice or tips from other 3D devs or artists! Do you have suggestions to make my materials look more realistic? Any ideas on how to improve my lighting setups? How would you handle reflections or shadows in a scene like this? I’m still learning Blender, so any guidance to help me improve my rendering workflow would mean a lot! 🙏 Here’s some of my work so far: