Copyright info for painting-textures:

Images used in paintings_kristoffer_zetterstrand.png (paintings in Minecraft) are made by Kristoffer Zetterstrand.
Kristoffer Zetterstrand is represented by Peter Bergman gallery. These are the original images that the Mojang team uses for their default paintings.
I claim no authorship over paintings_kristoffer_zetterstrand.png.

Kristoffer Zetterstrand's official homepage: http://zetterstrand.com/