This is why I often give up trying to do different things. I went to apply the image to Diffuse Overlay Color - now there's no Diffuse Overlay Color. When I posted yesterday, there was Diffuse Overlay Color on the Face Surface.

I tried adding the image to Diffuse Roughness and Diffuse Overlay Weight - no effect. The image has the tattoo, but it doesn't show up in the preview or render. | AAAAAAAAAAAAAAAAAARRRRRRRRRRGHHHHHHHHHHH!!!!!!!!!!!!