Its taken from the new anime: K which comes on Animax. Its acctually by another srtist, since this deviant has only been on for a week and has so far posted none of her own work. Give me a while and I will find the original artist.
Don't get the wrong idea . I'm trying to make a point of being better at busting art thieves or anything. I merely wanted to share the actual original source of the artwork because that always helps more than a Google reverse search for where the pic MIGHT be from .