... depend quality of meshing ( in Rhino model is not mesh ) - apprx. 10 000000 - 15 000000 polygons .
Everything is modeled - real 3D. I think to add some more details ...
... dont forget Rhino is CAD soft - except geometrical information there is a lot of more data ... also mesh working softs converting edge fillets with a lot of faces ... hope you can show me some result like that in 500 Kb ...