I was asking myself the same question, and I decided to do a "fanart corner" in one of my comics - I pick one fanart and feature it at the end of an episode, with credit and links.
Here's an example -
I made sure to ask the creators if they're okay with me posting their work, and I was happy to hear that all of them agreed to it. It's also beneficial for other Tapas creators who drew me something, because I recommend their comics while at it.
It also encouraged a couple of readers to draw their first fanart for me as well
It was sweet of them
I got the idea from the mangas I've bought, the authors featured fan letters, answered the fan questions and added fanart with some commentary at the end of a volume, which I found cool back then (and still do).
It seemed like a good idea to do it myself. I decided that one piece per episode with my own comic page will be the best option (than one full episode loaded with fanart only, for a couple of reasons).