Making macarons with radeon pro render, help?

Hi everyone! 

I've been trying to create macarons in blender while using radeon pro render. I've had a lot of difficulty with it, from making the macaron ridges and creating materials in radeon. I feel that my piece is really lacking- I don't know how i'll texture it and generally make it better. How should I texture a somewhat detailed macaron? Could I sculpt a macaron with details and bake it, and how? Sorry for all of the questions.

When I go into the render display mode, I get this: 

but I tried  fully  rendering it , this happened: 

The render is just.. empty. What do I do?

I included a project link if anyone wants to try and figure it out.

Thank you, advice needed.