Elegant woman on grand marble staircase in historic mansion

Elegant woman dramatic pose on a grand marble staircase in a historic mansion. She wears a champagne beige lace long-sleeve midi dress with intricate floral patterns, fitted bodice and flowing skirt, sheer details on arms. Accessories: pearl earrings, thin gold belt, gold pointed-toe pumps. Pose: standing midway on staircase, one hand on banister, looking down at camera with poised expression. Background: ornate carved marble, large crystal chandelier overhead, tall arched windows with soft daylight.