Yggdrasil is an immense tree that is central in Norse cosmology. It is sometimes also referred to as the “World Tree.”
This is an original hand-drawn design of my own creation.
This is loosely based on the theme of good and evil battling for the world/universe, with good in this case represented by a dragon, and evil represented by an octopus/Kraken-like creature. The opposition of fire and water also are visualized.
The style is influenced by the Urnes style of the Viking era: http://en.wikipedia.org/wiki/Urnes_style — but with my own artistic interpretation.