I think that's a great idea, I will now plan to do so myself. I used to add texture templates at Daz, and no reason to I can think of not to include that as an image as well. I've downloaded items where the mapping is not so great and the material zones are not properly labeled. I've taken a few items and created new mat zones. And plan to remap them at least for my own use or for use for others if the original creator agrees.

And do a image of the item with no textures just so one could see if I had included things like wrinkles and other detail.

Also I would like to ask if one is allowed to show a "Artistic" render labeled as such?

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"Imagination is more important than knowledge" Albert Einstein