The person appears to be a/an East Asian Female, approximately 30 to 39 years old.
An appropriate formal evening outfit for an East Asian female could include a beautifully tailored qipao or a floor-length gown with elegant details, such as lace or silk fabric. Accessories like pearl earrings, a clutch bag, and classic pumps would complement the look, along with a chic hairstyle that enhances the overall elegance.
For an East Asian female attending a formal evening event, a chic option could be a floor-length A-line gown in a rich jewel tone, featuring intricate lace details and a flattering off-the-shoulder neckline. This can be complemented with statement chandelier earrings, elegant strappy heels, and a sleek low bun hairstyle for a polished look.