@SaintFox

I don't think there would be a problem, so long as there is no nudity in the thummnail advertising your freebie. But I'm no expert on the TOS here, and can't speak for Rosity.  If in doubt contact one of the Forum Moderators, links at the top of this page. The worst they can do is remove your link. People only get banned for very serious, or repeated, breaches of the TOS.