Because I don't have a boss, editor, or publisher to answer to I don't have anyone telling not to go back and update art. This is second time I've done it.
The first time I entirely reinked and recolored my first Saturday Tales Comic because everyone instinctively wants to start at the begging of a series and I wanted that first impression to be a good one.
This time around all I did was take out the panel boarders and blur everything along the edges. It took an afternoon that I wasn't in the head space for more cognitive intense creative work. I tend to have a list of easier-on-the-brain work to pull from so that if I'm not feeling great I won't feel worse because I didn't get anything done.
All that said, if there is any indie publishers out there that wants to talk with a creator that has a day job and does comics of varying quality on the side, my email is BootlegPotato@gmail.com.