Ronny,
I know I implied that I am not fond of cell phone fossil photos for fossils but sometimes even I do it. Here is a cell photo of a stromatoporoid that I cut and polished. I needed to send this photo to another expert for help in determining the locality for the specimen. This piece was very soft and porous so it didn’t take a high polish. The patches that look pink/orange are remnants of the cerium oxide powder abrasive I use in the final polish that got into the pores. I think the impromptu photo turned out fairly well. Lighting was daylight from a window behind me. The professional background is vinyl place-mats 🙂