A young, dark-haired Aztec priestess, approximately 20 years old, with olive skin and piercing dark eyes, stands in a whimsical Art Nouveau crystal temple. Her pose is dynamic, hands outstretched towards a shimmering, multifaceted crystal altar, body slightly arched, conveying a sense of fervent prayer. She wears a flowing, turquoise and emerald green huipil adorned with intricate gold embroidery depicting stylized rain gods, complemented by a feathered headdress of vibrant blues and greens, reflecting the temple's crystalline hues. Her expression is one of intense concentration, a slight furrow in her brow conveying the weight of her ritual. The temple itself is composed of colossal, translucent amethyst and quartz crystals, forming soaring, organic arches and intricate latticework. Watercolor washes of soft blues and violets fill the spaces between the crystals, creating an ethereal ambiance. The light filters through the crystal walls, casting iridescent, prismatic glows across the priestess and the altar. The scene is rendered in a whimsical Art Nouveau style, with flowing lines and decorative elements, emphasizing organic forms and elegant curves. The perspective is slightly low-angle, emphasizing the priestess’s stature and the grandeur of the temple. The overall mood is one of serene mysticism, a blend of spiritual intensity and delicate beauty. The texture of the crystals is smooth and glassy, contrasting with the soft, flowing texture of the priestess's clothing and feathers. Background elements include swirling mists and stylized rain clouds rendered in delicate watercolor washes, echoing the ritual's purpose.