The following GH definition is an example of parametric design using just an image. The radio of each circle define the image greyscale values in each point. It’s important to change the colour of the image, and get a high contrast between the black and white scale
The tool using in the cnc is a V-carve 60º, over a MDF with a whit cover. Thats the reason why we have the holes in brown and the surface in with colour.