Had to look the word up to find out what exactly a "Nereid" referred to. Having done that the shot takes on a little context.
It's a nice enough shot, and I imagine it was delicate keeping the water off the face! I'm not sure what exactly has happened, but the face is a different colour from the rest of the body, I'm guessing it's the make-up but it does make it feel a touch abstracted from the rest of the model as the face and the rest of the body don't seem to sit quite right together.
Some of the splashes of water, particularly around the arms have reflected the lighting resulting in a bit of a harsh look to parts. The arm at the top of the frame is also the brightest part of the image, taking my attention away from the face. 5 from me.
Nereids are supposed to be friendly and helpful, which is not something I would guess from this image. At first I thought she might be preparing to drown herself a la Ophelia. The pose with the hand holding the arm ... the way its cropped it's hard to tell if that's her hand (I think it is) or someone else's restraining her for some reason.
I think it's great how her hair blends into the background like watercolour paint running onto a canvas. I sense there might be a topaz filter on this!