What it says in title. To be clear this is not about the actual drawing aspect, I get that. I'm confused about how exactly one obtains the lineart that needs to be overlaid on the pie/patches coloring.

Because, this is my understanding so far:

- unless it's basic poses, the base file lineart is not transparent. All mutation & age specific files have a cream base as default.
- pie/patches custom decor layer over the lion
- all the pie/patches custom decor I've looked at appear to have the exact lineart of the mutation they're overlaid for - they do not appear traced

So if my understanding is correct, pie/patches CD artists are either: obtaining transparent lineart files from some mysterious source that they overlay onto their pie/patches shapes, OR they are obtaining basefiles pre-colored with the closest colors to pie/patches (again from some mysterious source) and erasing them to form the pie/patch decor.

Either way, where the heck are you people getting this stuff from?? Please help