Essence Elemental Circle

Many of my creature and future project are based on this vision I have of basical elements and their interaction.
The element are divided in different group:
-The 4 Principal Elements: Fire, Air, that are the destructive couple, and Earth, Water, the creative couple.
        The circle has its balance: fire is strong on earth, earth is strong on air, air on water and water on fire. viceversa they are weak (fire on water, water on air etc...)
-The 4 Strong Secondary Elements: Steam, Thunder, Sand and lava.
        They are called the Strong Secondary because they born by the fusion of a strong principal element on his weak neighbourn (example: water on fir= steam);
-The 4 Weak Secondary Elements: Acid, Ice, Poison and Metal.
        They are called the Weak Secondary because they born by the fusion of a weak principal element on his strong neighbourn (example: water on fir= steam);
-The 3 ballance Elements: Wood, yang (positive, light, withe, pure, etc...) and ying (negative, dark, black, corrupted, etc...).
        The last two element are totaly complementar, they cannot be separeted and they work in a strange way, they are antagonists and indivisible at the same time.

Some of my dragon based on this elemental circle:
Wood: Arboreal Dragon
Acid: Corrosive Dragon
Metal: Metallic Dragon
Fire: Incendiary Dragon
Thunder: Storm Dragon
Ice: Boreal Dragon
Water: Sea Dragon
Poison: Viper Dragon
Steam: Hazer Dragon
Earth: IN THE FUTURE, some where...
Air: IN THE FUTURE, some where...
Sand: IN THE FUTURE, some where...
Lava: IN THE FUTURE, some where...
Ying&yang: IN THE FUTURE, some where...

New Version of this one: Elemental Circle - Dragon's World
Media: Ink brush and watercolors