What a lovely beast. Plenty of detail all over and nicely controlled flash. Good execution. Good result.
60mm macro lens? Single/twin flash? Diffusion arrangements? It would be nice to know a bit more.
f/18. Smaller than many people would use. Works well to give coverage across the subject (although being that square onto it, would a larger aperture have worked? (Not a suggestion - I use even smaller apertures as it happens - I'm genuinely curious. Depends on how much curvature there was on the subject - possibly more than is apparent from the look of the image.)