female_back, fit_athletic_sexy, young_adult, lying_face_down_on_towel, blue thong, vivid_blue, smooth_elastic_swimwear_fabric, tight_high_leg_cut_minimal_back_coverage; lying_face_down_on_towel; sandy beach, midday, harsh direct sunlight at 90 degrees; deep_bronze, luxury_beach_ad; hyperrealistic, very_high, vibrant_summer_palette, hard_crisp_shadows, luxury_beach_ad, extreme_ultra_detail; top_down, tight_crop_centered_on_back, 50mm, extreme_sharpness, close, shallow, ultra_high; harsh direct sunlight at 90 degrees, sunlit_highlights