To fix unrealistic furniture 3D models, refine material textures, adjust proportions to real-world measurements, and use natural lighting that mimics physical spaces.
Add material details like wood grain depth, fabric weave, or subtle metal reflections—flat colors make furniture look "plastic." Correct proportions (e.g., a dining chair seat height of ~18 inches) ensure models fit real spaces. Use soft, directional lighting (like window light) for natural shadows; harsh glows break immersion.
For beginners, test free texture libraries (e.g., Poly Haven) and reference real room photos to match how light hits actual furniture—this simple step helps models feel more "present."