This personal artwork is a bit different to my other artworks but it was a concept I had in mind since a long time: to represent "GNU/Linux" in a portrait. On left, you can see Richard Stallman -the funder of the GNU Project and the free software movement- and on right you can see Linus Torvalds -creator and lead developer of the Linux kernel-. Both portrait are overlaid with the GNU license on left, and kernel code on right. They both are my personal heroes and big inspiration. I hope one day I'll be able to meet them.
License: Creative Commons Attribution (CC-By)
Software: Krita, Inkscape and Gmic.
Other version: 2396x1578px landscape here, 3508x4060 portrait here.
[edit: 2017-12 ] I received often the same question about this artwork: is this a derivation of photos or a painting done from scratch? Answer: It's a painting/creation done from scratch; here is a work in progress screenshot while painting before I added details and (many) filters over it. Here are the original photos I used as references on my second monitor while painting to match the "look alike". I hope it will help to proof this document is just a digital painting portrait.