Here comes a model that I have created in Rhino and Z-Brush and the texture map creation was done in Z-Brush and Photoshop - Rendered in Octane.
After I finished some ideation sketches I continued with Z-Brush to develope the rough form and restarted in Rhino to get some clean surfaces.
After some tests with mental ray, octane seems to be the better and faster solution

Refracty