Hi Boni, you still need a specular map. Usually, a surface is never evenly shiny, and with a "specular map" you indicate, which parts of the surface are more or less shiny. But instead of a "specular map" you can also use a "roughness map" for the glossy shader. I always use a "specular map" for all shaders, with skin shaders also a "highlights map" on a second gloss layer.

LG NobbC