I started my comic with a more detailed plan and outline but as the series goes on I made A LOT of changes, if you see the outline when I first started the comic over 4 years ago then it's a very different comic from now. The changes I'm talking about are mostly character focused, I feel like as my writing developed I found better ways to portray my characters and their stories so I made changes to the scenes I'm storyboarding, then I realised these changes would affect things in the future so I made changes to the writing in future chapters. My basic outline is still in tact and I have an ending in mind.
I think this approach has it's pros and cons, there are a lot of changes I wish I could have done to the start of the comic so that I'm able to foreshadow more or realize certain side-characters wouldn't be as important later on and I wouldn't introduce them at all. However I feel like I'm currently making a much better comic than what I would have made if it were my previous outline and I'm happy with it! Although the only reason this is working out for me is because my plot is extremely simple and it's really more of a character focused story, where I'm able to change it and I wouldn't end up with plot-holes because there really isn't a huge "plot".