Thumbnail váy maxi đi biển nữ tính

Create a complete vertical 9:16 promotional thumbnail/poster, not a plain single image. Use [ảnh người mẫu] as the exact model reference and [ảnh sản phẩm] as the exact maxi dress reference. Design a Vietnamese summer fashion poster for a beach maxi dress. Show a large hero image of the model wearing the dress, smaller preview frames in different poses, and lifestyle callouts that highlight feminine style, breezy fabric, and vacation mood. Include a bold headline, a short subheadline, and a clean modern fashion layout. Preserve the model identity and the exact dress design. Make it bright, attractive, and optimized for social selling. No watermark, no anatomy errors, and no unreadable text.