Not one step back! Always forward, for the lead pile! Once I paint a figure I have a rule to never repaint it. I don’t spend time striping figures I finished years ago, or spend weeks painting even a character figure. Once they’re done, they’re done! You know, except for the times I go back and strip figures and repaint them…
So I don’t generally revisit minis. I’ll repair damaged minis, put decals on minis long after I finished painting them, and I have some minis who’s bases were never finished and I’ve had to go back and do those. The lead pile is never small enough that stripping a pile of minis and then repainting them because they’re not perfect is a good option.