Create a hyper-realistic full-body portrait of two girls who are twins, sitting on a stone bench, with softer and more dramatic lighting from the upper right casting light upon them. They have long, dark hair tied in ponytails, adorned with rhinestone hair accessories, and are wearing elegant black evening gowns with lace or embroidery details. Adjust their pose to be more elegant and their facial expressions to a reserved smile, as they hug each other, conveying a sense of companionship and unity. The background should be simple and minimalistic, with the lighting creating subtle shadows to accentuate their features and expressions. The image should have a modern and stylish mood, with a touch of casual elegance.