This is actually a studio shoot.
I have a small blowup wading pool in my studio and I lined the pool with black material which extended up to a background.
The black material on the bottom of the pool is what created this fantastic reflection in the water.
Lighting was a 700mm beauty dish
Model: Silhouette d'amour
MUAH: Mishel Vounatsos Bratsos
Thank you for sharing not only this great shot, but some explanation as to how you achieved it. Fabulous work!