This group allows all sorts of HDR Images. There is little restrictions on what can be submitted, but the moderators will remove anything they feel does not appear to have used HDR techniques.
No Details about technique, software, number of images etc. are required to submit, although it may help the moderators to confirm authenticity. Still if it doesn’t appear to have benefited from using HDR methods it may be removed without much explanation (but this will only happen to obviously wrongly categorized submissions).
You should only submit up to 5 images a day (if deemed necessary), and there is no initial approval requiring. Similar variation submissions will not only be accepted but encouraged to help show variety in processing.
Photographs of Artwork unfortunately ultimately do not qualify. They can not be lite in a way that allows bright highlights and super dark shadowed areas, so they can’t benefit from HDRI techniques.