You need to make a specular map and plug it into the specular node of the Principled BSDF.
You can use Krita or GIMP to do this,or you can generate one with Substance Painter.
You need to make a specular map and plug it into the specular node of the Principled BSDF.
You can use Krita or GIMP to do this,or you can generate one with Substance Painter.