Regardless of whether you're creating interior spaces for rendering, for realtime - maybe for both - this video talks about a workflow that can optimize your scene's realism for a photorealistic end result. While I'm targeting Blender, the concepts discussed here are applicable to most 3D design suites.
My renders are available here: / lonedevrenders
Explore my 3D models/environments here: https://sketchfab.com/LoneDeveloper
This video uses Entering Graciously by LIMO Recording Studio ( • Entering Graciously ) under Creative Commons Attribution 2.0 Generic (CC BY 2.0), in addition to music taken from the YouTube audio library.