This model is part of a set of three sea urchin shells with wavy little finlets. I’m pretty sure these don’t exist in real life, but who’s going to notice?
Nice design, printed well. Just the little textured details are a bit sensitive to stringing. The opening at the bottom almost fits a LED tea light: so, maybe if printed a tiny bit larger and in a translucent or white color, it could hold a tea light nicely?