Hi Bill, another thing I noticed is that your tool is a 1mm diameter bit but your project is only ~10x5mm in size - judging by what appears to be the default grid with major lines every 10mm and 2mm subdivision lines. The red/green/blue axes are also 1" in length, so the project is pretty tiny. There doesn't appear to be any areas inside of a project that small that the 1mm bit would be able to remove material from without infringing on the parts of the input image that aren't supposed to have material removed from them, maybe a peck or two around the wrists holding the glasses? The horizontal milling operation will only remove material where it can be removed from without cutting into parts of the project that rise through the depth of each cut layer:
