I didn't understand, how to capture a texture from the cylinder-shaped object, so I remembered about Meshroom and decided to "scan" a real easter cake (fortunately it was already being in sell, despite it was not even the Holy Week). The result was surprisingly good (my previous experiments with Meshroom gave much worse results).
I had a hard time with the icon-lamp: the number of vertices reached more than 14 million and I got many lags and freezes. It was not easy to create a procedural flame, but I think the result is worth it.
PS. It rendered surprisingly fast: less than 2 hours - with 8916 samples (Cycles). Blender 2.8 can use both CPU and GPU for rendering and it noticeably speeds the process.
3D artist's Easter - Timelapse
Easter Cake
Icon lamp