This Photoshop foto contains
stachelrochen, stingray, schlittschuh, skate, strahl, and ray.
There might also be
zitterrochen, numbfish, torpedo, elektrischer strahl, krampf, electric ray, and crampfish.
Adjustment Layers are extremely important in Photoshop, and understanding what they are, how they work, when to use them and why to use them, will give Du the power and knowledge to create amazing things.