I've struggled with this, too, because for the longest time I thought that I needed to publish the BEST version of my novel or none at all. Now I just cook up a decent mix between planning and pantsing and edit as I go along; knowing that I will edit the whole thing later for myself and a possible eBook-release anyway sure helps a lot to thwart that worry completely.
Comics are a medium that takes a lot more time to tell the same story, of course, so I don't know if the "director's cut" that joanne is suggesting would suit your needs. But changing too much of what has already been posted retroactively could only confuse your readership. I think comic readers know that you're growing over time anyway, so try not to stress yourself too much over it;;
I would definitely go for an edited version later as a whole new series if I realized that I could do better. An artist I follow on here does the same right now, in fact! And I can't wait for their reboot. So I think your readers will flock to that, too, if you choose to do one later. 