Re: skin tone - yes. And both in Poser or in the texture itself are good under different circumstances. A few MAT poses to darken/lighten the base color in Poser can add flexibility to a set. But, it will changes all areas of the skin the same, so if you take a Caucasian texture and use Poser's base color to darken it to African, for instance, the palms will be the same tone as the tops of the hand and give away the trick.