I’d like to have the Glowforge engrave it and then cut out around the girls instead of a big rectangular frame. Does anyone know if Inkscape has a way to isolate, trace, or border a picture in that way? (The original is, of course, a rectangular image with a bunch of white pixels where the forest background used to be.)
On my phone so can’t give detailed advice. Easiest way might be to use the line tool to trace around the girls with a different color that would be set to cut. Takes practice but can easily be done in a couple minutes.
Since I’ve got both of those, I did a quick rough outline around the girls for you and saved it as an SVG file. If you want to cut out the area between the legs, you can practice with the manual pen tool in that area. Otherwise doing a manual trace on something like this would take a very long time.
Thanks to all the suggestions. I continued in Inkscape only, using a stylus and some trial and error to get the freestyle draw tool (hard to do on a trackpad!). Found that extreme close-up zooms tend to make things smoother on the final cut.