The VSS skin templates made those texture much better, more realistic.  I'm glad it worked out for you.  Yes, when you delete the VSSProp, everything associated with it will disappear.  Saving the modified version into your library will guarantee that you will not lose the changes, however, if you are completely done with your texture conversions, you can delete it from the scene.  It will not revert the skin textures on the models, that is permanent.  The colors in those boxes in D3D's FireflyRender settings are dependent upon the raytrace/depth map selections either within the settings themselves or the objects present in your scene.  It may be worth playing around with Parameter/Properties options in your objects and lights and see how they influence your render sets. 

Suggestion:  On the PoserSurface, uncheck the Reflection_Lite_Multi, you don't need that feature on clothing and skin textures.  It has more relevance on shiny surfaces.  Also, set filtering on the image nodes to none, Quality has a tendency of downgrading the texture image resolution.  This is fine if the model is placed in the distance, not so good if you plan to bring your subject closer to the camera.

As an added note, I notice that your t-shirt image is also plugged into, what appears, a black specular_color with a specular_value set to 1.  Double check that color chip by opening up the color picker using shift+click.  If the RGB values are truly set to 0, there is no need to plug the image in it.  Black is the same as setting the specular_value to 0, it is doing nothing to your texture and is unnecessary.  And if you are not interested in doing any displacement, unplug that image map and delete it.  Keep the material room clean and simple.