im very much so a beginner at certain blender concepts, especially nodes and textures. so i ask kindly for your patience. i have a model that i want to add a shiny speckled texture to all over, that only shows up in areas most saturated by light when the viewer is looking at it. i am making an avatar and i found another one with this example: [![enter image description here][1]][1] and ive just about given up with trying to research for how to do this elsewhere lol any help is much appreciated


  [1]: https://i.sstatic.net/f5sYcDt6.png