Your shoes 3D model appears dark in Blender typically because of insufficient scene lighting, unoptimized material settings (e.g., low specular or too high roughness), or a viewport mode that doesn’t preview lights/textures properly.
- **Lighting**: Add a Sun or Area light (Shift+A > Light) and boost its intensity—Blender’s default lighting is often too dim for shoe models. - **Materials**: Check the Principled BSDF: low specular reduces reflection, while high roughness scatters light (try specular ~0.5, roughness ~0.3 for typical shoes). - **Viewport**: Switch from Solid to Material Preview (top-right) to see how lights interact with your model’s materials.
Try this quick fix: Add a Sun light (Shift+A > Light > Sun), set strength to 2–3, and use Material Preview—this usually fixes basic darkness without extra work.