Creating a brass snake pendant with pistons is an ambitious and creative project that blends organic curves with mechanical details. To make this look truly dimensional on metal, you'll likely want a 3D relief effect (engraving at different depths) rather than a flat surface mark. Here's how to approach it.

Brass pendant, image processed using Imag-R brightness, contrast, gamma, size, and dpi. Lightburn and 60w fiber mopa laser Machine.