Here is a little more complex way of doing it. I don't do the math stuff so I leave that to EZSkin2. The shader you see here is just a texture and bump ran through EZSkin. I have marked in red the new nodes for the reflective stuff and the yellow dashed line is where EZSkin normally hooks everything up. Also, I don't use Poser lights all that much and this image uses none. All lighting is coming from BB's EnviroSphere. Somebody else might be able to figure out how to incorporate glossy speculars  when using the Poser lights. Also, also, shifting the blender blend control nearer to 0 makes it look more like lip gloss than reflective paint.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740