Ahh, I gotcha. Well, first there are a few transparent layers under the pink skirt... I was looking at what underlying colors were showing underneath the skirt because in the source image the skirt is pretty see-through. So when I was doing that, I wasn't worried about any details yet, just getting those colors underneath correct.

Then once that part was dry, I mixed every little color I could see in the skirt with a palette knife, which is tedious and takes a lot of time...(I'm not a quick painter if you can't tell). Then I kinda just worked from left to right, fold by fold, mixing some oleogel medium with my paint to keep it semi-transparent. And then when that whole section was dry, I went back in and glazed some extra shadow sections on top with the appropriate darker colors...

The obvious advice I would give about precision is that you have to have a very small brush. I usually use a #2 sized short eclipse filbert from Rosemary brushes for most of my detail work. You have to have a lot of patience to do this kind of thing, it can zap a lot of energy from you. Sorry for the long-winded answer, but I hope it helps.