photorealistic, photo, girl on a bicycle, rear view, she is riding her bike very fast, straight road in front of her, (background has the effect of a very fast ride:1.5), 18 years old, sexy appearance, Cycling shorts, sexy bra, large hips, petite, big butt, (very thin waist), trees , colorful sky and bright clouds, forests and fields and valleys, beautiful nature, the speed makes everything go by, view of the valley, full body view,