The model is located at the center of the coordinate system and corresponds to the scale of the real world.
+ neat mesh topology made of quadrangles;
+ light weight and rational number of polygons;
+ high resolution textures;
+ correct location of pivots;
+ competent sweeps;
+ logical names of groups, objects, textures and materials in Latin;
+ no junk geometry, etc.
formats: 3Ds Max 2018, OBJ, FBX

references were taken
https://www.laredoute.fr/ppdp/prod-601176776.aspx