Avoid high density models and always try to optimize. You want your Sketchfab model to run smoothly on most computers and also it is easier to unwrap later on.

Tutorial: Using Vray and Sketchfab to Render and Share Your 3D Models February 13, 2016 ...

Photorealistic Ray Tracer Adds Denoiser Masking, Cylindrical Decals and More to Streamline the Visualization Process V-Ray 6 for 3ds Max, update 1 Example of V-Ray 6 for 3ds Max, update 1 render ...