Take a look at this impressive rig of a human hand skeleton that combines the fluidity of human motion with a metallic, Terminator-like surface, showcased recently by 3D Modeler VinnieBwoy. According to the creator, the hand was modeled and rigged at 60 FPS using Blender, the popular free and open-source 3D software. Despite the apparent complexity of the hand's surface, the artist noted that the material was created with a simple metallic Principled BSDF shader, with an HDRI doing much of the heavy lifting.
Also, check out Vinnie's earlier artwork inspired by skeletons:
