Create an ultra-high resolution 12K mixed media portrait of a human face seamlessly blending organic and mechanical elements against a crisp white background. The left half of the face should be hyper-realistic, with every pore, hair follicle, and skin texture rendered in microscopic detail. The right half transitions into an intricate biomechanical structure, with gears, circuits, and metallic components precisely etched and shadowed. The eye on the organic side should have a lifelike iris with complex color variations, while the mechanical eye features a camera-like aperture with visible micro-motors. Incorporate delicate, hand-drawn pencil sketches flowing from the organic side, gradually morphing into complex mathematical equations and binary code on the mechanical side. The hair should begin as ultra-fine, individually rendered strands, transforming into flowing copper wires. Subtly embed the text "ArtGuru, Professional AI Artist at your service" using a minimalist sans-serif font that follows the contours of the face's features. Apply advanced 3D rendering techniques combined with traditional artistic elements to achieve a striking contrast against the pure white background. Utilize high-fidelity HDR effects to enhance the depth and dimensionality of the portrait while maintaining the white backdrop's clarity.