regarding to much color saturation .. play a bit with the Ambient colors and you will see what happen with the model and textures.. just what you need.. much people render a model as a pic of beton but if you use spot light and right ambient color the skin will turn to a soft looking natural skin and don't lost the details of the textures.. and I know what I am talking about.. trust me for a moment I spend many years and every day render just only people and nothing more.. with bump map and simple color you can get the same effect as with high textures of the skin :) normal professional people make first only bump map in gray scale then colorise the map and not vice versa as we do for Poser.. but that is other story and old .. this way was made textures for Walking with Dinosaurs a time ago and this great tip was from the creator of the textures.. and the effect..wow