Ultra-clean macro product photograph of a glass dropper pipette with a single clear serum droplet forming at the tip, suspended mid-drip, visible micro-bubbles inside the liquid, razor-sharp focus on the droplet edge and glass texture, minimalist studio background in soft light grey, high-key scientific beauty aesthetic, smooth specular highlights along the glass, controlled reflections, luxury skincare editorial style, shot with full-frame macro lens look (100mm macro perspective), shallow depth of field, clinical precision, photorealistic clarity, subtle gradient lighting from top left.