Part 1 - [link]
Part 2 - [link]
Part 4 - [link]
Austin Kleon's "Steal Like An Artist" - [link]
Best book there is for Art.
Intro to GIMP and Digital Painting, for people who perhaps want a little help with the GIMP.
The 3 pictures featured in my skin section which I borrowed for educational purposes.
The base is by the wonderful ~MalevolentMask