Well I don't know a reliable one here on AsianFanFics but you can use Allkpop just like the other person said, or you can go on tumblr and see all the updates the fans post. If you dont have a tumblr you should make one and follow me~ (URL-xiiuhann) I post the lastest stuff about Exo and you can use the photos on tumblr for your fanfiction.

Um, well, allkpop.com could help you out with that. Also the way I kind of keep up-to-date with them is via Youtube, I'm only subscribed to SMTown, but you could subscribe to their official Youtube channel! Hopefully this was helpful ^_^