Is that with a traditional air brush? That is great, but would take a lot of time.
As to favorite medium, I think we lost some of the conversation here, but I like digital, pencil and pen. For digital I usually use Corel Photopaint or Corel Painter. Lately I have been using Colors 3d on a Nintendo 3ds, just because it is simple, and compact.
I also enjoy some vector work in digital. As far as traditional painting I have used watercolor some, but not a lot.
Various members of my family enjoy oils, acrylic, watercolor, gouache, pencil, pen, marker, etc.