I 100% do not want people to post images in my comments section. People have sent me fanart just fine via social media, discords and these forums. I feature fanart in end of chapter extras with links to people's stuff, and it gets them subscribers better than if their work was shoved down in the comments somewhere, because it's in the actual pages of the comic. I believe last time I did a fanart feature, most of the featured creators got about 10+ subs out of it, so I'm pretty happy with this approach.
People being able to post copyrighted images onto my pages, or stuff that might not be appropriate to the rating of the comic, or posting adverts for their own stuff to take advantage of my larger audience sounds like an absolute nightmare to me. Especially being in a european timezone, it could take hours for me to delete it if somebody posted nudes in my comments at a time when I'm asleep. It'd be a pain to deal with, and it'd definitely get used to target popular creators to harrass them or try to get them delisted or something.
Comments sections are a bit sparse when you're starting out, it's true, and a lot of the comments if you don't seem to have any will be things like "oh wow, I just discovered this! I hope you keep going!" or "Why does this have so few readers!?" etc. But it doesn't stay like that. If you keep posting, building your audience and providing episodes with enough content in terms of funny jokes and exciting or dramatic moments, people will start commenting on those. If you're struggling to get interesting comments, it's usually a sign that either your content is too short or not enough happens in your episodes to comment on, or just that you're not making the kind of comic it's easy to comment more than just "lol!" about, which is why a lot of gag comics do better on social media than on a platform like Tapas where the most popular content is more story-focused.