I don't think it would be a problem if people used the "mixed medium" gallery for those renders that have a lot of painting (clothes, hair, etc) in them. That's what it's there for. Unfortunately, there will always be those images that have only part of a Poser figure, exported to Cinema 4d...then rendered there...later composited with a sky rendered in Bryce or Vue... then painted over in Photoshop or Painter.... then posted in the Poser gallery. eh.