Thank you so much for these explanations, PK. It was certainly needed as I sometimes doubt about the choice to make when I upload an image.

As for me, it happened only once that a moderator change the category of my artwork and I didn't mind at all :-)

I just have one more question : when I use a photo as background and a Poser render should I put it in the Poser gallery or the mixed medium gallery (intended that the Poser work is mine and the background mot necessary from me...)