Just out of curiosity, where will you upload an art that violates Tumblr’s site policy, but it’s for non-pony challenge? You won’t be able to upload it to Derpibooru?

Probably e621 I suppose.

Paheal won’t let us have a tag and FA is a little tricky at times too.

If it can’t go up on e621 OR Derpi then that probably only leaves Paheal, but that’s a pretty unlikely event.