
Welcome christine!
Hhhmm, I think possibly, yes. A raster graphics program (Inkscape is vector) might do a better job. Do you know that you specifically need a vector image to do the etching? It might depend on how you want to create the stencil. Are you planning to use one of those cutter machines? I know I've seen a tv commercial where they did a glass etching using some brand of cutter. But it was not a photo. If you are planning to use the cutter machine, you can visit our Inkscape and cutters forum, to help learn how to integrate Inkscape (because they usually come with other software).
But you can still use Inkscape either way. You can definitely import the photo. Then Path menu > Trace bitmap. This tool can convert your image from raster ("bitmap") to vector. And there are a number of settings you can play with there. Be sure to read the instructions in Help menu > Inkscape Manual. But also do your own experimenting. I'm not sure exactly what effect you want, or I could offer suggestions. Note that there's a bug in the update feature (preview) for one of the settings. I think it's Brightness Cutoff, but it might be Edge Detection, I can't remember for sure. If you run into trouble getting the preview to update, let us know, and we can hopefully help.
Also no worries about being new to Inkscape. That's why we're here - to help
