I tend to start with a tracing of the headstock which I put into program called Draw, which is part of a free, open sources Office Suite call Libre Office. It is easy to resize the image, to print to PDF, etc. If I need to edit the graphical image I usually use Paint.net, another free, open source program for graphics editing.
These are not super powerful programs, but they are relatively simple to use, free and don't take a great investment of time to learn. They end up being a good fit to my relatively limited abilities, budget and willingness to sit in front of the computer ;-)
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