Spontaneity is a great thing IMO, but sometimes there are just too many little things that didn't quite work out on this here comic page. The devil is in the detail (how trite that may sound). So, the version on top is the new one. Not a big change of plan, but an improvement, i hope.
I don't do this kind of thing often, but when there is such a situation, drawing the whole thing over is actually less work then to "tweak" it digitally... I hate that. It never works and you don't win time. It's one of those things that will make me want to burst out in a bitter old man's rant. Digital technology may make several things easier, but it is solely geared towards your convenience. So in the worst case, it leads to lazy artists cutting corners, or trying to do that. I for one happen to like to draw a lot, so, commercial artwork aside, i don't mind spending time on it. Creating is not something that you want to get over with as soon as possible, right?