Inkscape's Bezier tool is a great resource for making high-quality tracings of pictures. However, the “curve” feature can be frustrating (especially for new Inkscape users). I am a big fan of easy hacks—in this video, I go through the EASY method of using the Bezier tool to create vector tracings. Using this method, you can EASILY make some really nice (accurate) tracings.
Inkscape is a free graphics design software solution that is completely free (it is similar to Affinity Designer or Adobe Illustrator). You can download your copy at inkscape.org.