To make a 3D model with normal maps look perfect, focus on three key steps: precise normal map baking, clean geometry topology, and lighting that enhances surface details.
Normal maps simulate high-poly details on low-poly models—bake them without stretching or artifacts to avoid distortion. Clean topology (smooth edge flow) ensures normals calculate evenly, preventing uneven depth. Use soft directional lighting to highlight details instead of washing them out.
For beginners, practice with a simple beveled cube in Blender or Substance Painter, then test in your target engine (e.g., Unity) to adjust lighting and normals until details look natural.