I kind of really want to make this into a cosplay.
It's just so stunning in every way. My favorite feature though is the face. So elegant, so light, youthful. The face is almost enviously beautiful. Her eyes are of a wonderful pale blue color, it's alluring.
I found this picture very catching, her stance is so attractive than it makes me feel curious and wondering what would be her goal, what the possible secret behind her. The moon and night shading adds it even more mysterious feeling, and so her outfit and her hairstyle, I like it's wavy and light look. I also have to point out the water around and the way made the effects of it, I love it. There's only one thing I'm not sure about, maybe it's my bad understanding of its perspective, but the arms might be a bit short.
Finally, it's an awesome piece of art and very inspiring
(I admit I don't know the game, so I comment it as a whole only based on your picture )