I probably need a tutorial.
Downloaded 64-bit Inkscape. Pasted the
above .jpg image into Inkscape. Traced paths (with smoothing disabled), then did a bunch of bucket fills, for more uniform colors.
How do you scale the working image? All the paths and color edits appear to be on an upper layer, with the original image beneath. When I scale with the selection grips it
only scales the original image beneath - all my edits stay the same size, in their own top layer.

Ridiculous.
There's no menu choice to Flatten Image, or Scale Image either.
I just need to know that one can print at various sizes without loss of resolution - so the artist can sell larger prints.
Hope the artist appreciates all the effort I'm expending to offer her good advice.