The textures and bumps are there for your color (basically) and all the detail too. The shaders are there to help define the property of a specific material, in your case skin. You can use a blinn if you want, but it wont be as good without alot of hassle of making maps for alot of the channels within the shader.

Just take care with the fast skin shader though, its very time consuming the the results can look good if you tweak them enough. The most common mistake with the fast Skin shader is that alot of peopl tend to make theirs look waxy and transluscent. The key is subtlety...have fun

J