How to Trace in Inkscape – Tracing SVG Files in Inkscape – Create Your Own SVG [Inkscape Tutorials]
http://www.youtube.com/watch?v=8l3_isklQLU
http://www.youtube.com/watch?v=8l3_isklQLU
https://www.youtube.com/watch?v=MH7GHtsGBew
https://www.youtube.com/watch?v=8l3_isklQLU