Create a stunning, vibrant illustration for an 'Elemental Extravaganza Contest' featuring personifications of the four classical elements: Earth, Water, Air, and Fire. Each element should be represented by a fantastical character or creature. The Earth character might be a powerful, green-skinned giant with rocky armor and lush foliage. The Water character could be an elegant, fluid figure made of shimmering water and adorned with aquatic elements like seashells and coral. The Air character might be a wispy, ethereal being with flowing robes and wings made of clouds and wind. The Fire character could be a fierce, radiant figure with a body made of flames and glowing embers. Set these characters in a magical, dynamic scene where they are showcasing their powers in a grand, celebratory contest. The background should be a vibrant blend of their respective environments, seamlessly merging into a breathtaking, otherworldly landscape.