A towering, benevolent alien, three times the size of a human, its entire body a magnificent structure of sparkling amethyst crystals, extending a large hand in a gesture of friendship, shaking hands with a normal- sized human, detailed human features, expression of wonder on the human's face, in a futuristic cityscape, soft volumetric lighting, high contrast, 8k, highly detailed, cinematic, photorealistic, made of sparkling amethyst crystals