Well, sounds like it will be okay for the nudes, though it might get your profile flagged as NSFW (which might not be a bad thing; in fact, it's part of why I moved here):
"NSFW flagging in is development. This policy will go into effect as soon as flagging is completed. We respect the diverse views of the Ello community. Not everyone wants to see porn. If you regularly post adult-oriented content, please respect those in our community who do not wish to see it by flagging your profile NSFW."
BDSM might have a problem, depending how they mean 'encourages people to hurt each other':
“We don’t have a problem with porn at all,” Mr. Budnitz said. “But we would have a problem with bestiality or porn that encourages people to hurt each other*, or anything that has to do with children.”
Though that could mean rape/snuff/abduction porn rather than depictions of consensual BDSM.
* emphasis mine