A surreal gothic digital illustration inspired by Hieronymus Bosch’s nightmarish figures and Bridget Riley’s dynamic optical illusions, depicting an unholy nun with pale, cracked porcelain skin and angular, blasphemous elegance. She stands rigid at the center, clad in a tightly fitted black habit that flows in angular, sharp folds, with blood-red stitching tracing jagged, vein-like patterns along the hem and cuffs, resembling dripping corruption. Her veil cascades like the dark wings of a fallen angel, framing a face that is both alluring and horrifying, with crimson lips, hollowed eyes devoid of pupils, and faint cracks spreading across her white visage. An inverted crucifix rests against her chest, sealing her ominous presence. The background is dominated by a pulsating optical illusion inspired by Riley’s "Movement in Squares," but reimagined with sharp, chaotic black-and-white lines radiating outward in broken geometries that warp violently, pulling the viewer’s gaze into a dark central void. Behind her looms a devil-like figure with grotesquely elongated limbs, razor-sharp claws, and a twisted, fiery grin, its fiery red eyes appearing to pierce the illusion. The cold, cracked stone floor beneath her glows faintly with crimson veins, rooting the composition in infernal energy. The fusion of distorted geometry, gothic detailing, and surreal dread creates a masterpiece of eerie tension. HD, 8K quality, ultra-detailed, gothic surrealism, flawless composition.