I am a Chilean Illustrator, aka Fiestoforo, living in Santiago of Chile.
I have been collaborating in Wikipedia since 2005, and joined Wikimedia Commons in 2006.
I illustrated first for fun and later as a way to express myself.
I usually make diagrams and schemes. I work with GIMP and Inkscape, open-source software.
You can see my tutorial (easy to follow) about how to make diagrams, that you can use in Wikipedia.