Well, i don't know the exact design of Elemental Charmer's Magic Circle, but i try to draw it similar to the real one... (you can see Charmer's magic circle in Spiritual Art Cards except Greed, and in 3rd form of Charmers like Avalanching Aussa, Raging Eria, Blazing Hiita, and Storming Wynn).
I don't know Dharc's magic circle since he isn't featured in Dark Spirit Art, and there's no other form of him, so i didn't made Magic Circle for him.
Brown = Aussa's (Earth Charmer)
Blue = Eria's (Water Charmer)
Red = Hiita's (Fire Charmer)
Green = Wynn's (Wind Charmer)