You're always allowed to repost them to your own account, provided you give a link back or something.
I also will post the art on the sites I am on; FA, Inkbunny, SoFurry, Weasyl, Patreon, and (possibly) e621. I will do this no matter what, sorry, but I don't do site-specific art posts unless, of course, it goes against the site's rules.
Also, if it's G-rated, art I make for you is also open to be made into a print for others if I go somewhere where I'm selling prints. While it's not often it's still a possibility.
I also do not take "secret" commissions and will not only share the art with you. If you want me to wait to post it until a later day that's fine but I will always post finished art on all my sites.
Most of these people don't really worry about but figured I'd throw it out there. ♥