Illustrate a hauntingly beautiful fusion of a mushroom and a skull, blending elements of decay and growth in a mesmerizing composition. The skull, weathered and ancient, is adorned with intricate fungal growth, delicate mushrooms sprouting from its eye sockets and nasal cavities. The mushrooms vary in shape and color, ranging from vibrant reds to earthy browns, creating a striking contrast against the stark white of the skull. Fungal tendrils intertwine with the delicate bones, weaving a tapestry of life and death. Soft, ethereal bioluminescent glow emanates from the mushrooms, casting a surreal, otherworldly light upon the scene. The overall atmosphere exudes a sense of eerie beauty, a delicate balance between the macabre and the natural world.