Wow, this has been a longer day than may be apparent here. I spent most of it shopping for and experimenting with various apps. I have never done much work with layers, and had forgotten most of anything I had learned over time.
I'm learning to appreciate them more every hour. And I'm feeling cramped by SketchBook Pro's limit of just four layers to an image. Enter ArtRage. I think I counted fourteen layers that I was able to open all at the same time. There may be no limit, I just don't yet know.
I entertained several more apps, some quite well respected, but none had all the features I was looking for, though most had far more features than I was looking for. Testing, evaluating, reading descriptions and reviews, all that takes a lot of time.
So far. ArtRage appears to be the most likely app of choice, but I'm still looking.
Meanwhile, back to Sketchbook Pro, since I couldn't get familiar enough with the drawing side of ArtRage in the time I had available.
I cranked up the band and got our couple moving a bit. This is becoming really a fun project, although it is taking a lot longer than I had anticipated.
i'm getting very excited, and I hope you are, too.