If you want to post for free, you can use imgur, just make your posts 'hidden' and copy the url they give you. You can upload a number of different types of image files, too. I use it to post HD versions of my 18+ bonus stuff for Patreon because it lets me set up pages in a scrolling format that can only be accessed by the hidden URL. If you post a censored version here on Tapas, just put the URL in the comment section if you want people to freely access it.