Have you guys tried focusing the entirety of your efforts into on project instead of distributing it into many? I'm not sure how far of the story you plan, but it's worth putting effort into both character design, and more importantly have a rough story line that will have an idea of where you want to end. At the moment it seems like you guys are juggling multiple webtoons, and in manga I would definitely say:
Quality > Quantity. Although It's great that you guys are practicing by making multiple different series, because the experience is definite valuable, I would say that you might want to get a solid foundation before releasing it online and the such.