any details about the black marking from his neck to tail? It would really be helpful (ie is it a tribal marking? Just a stripe down his back?)
You might also want to mention the black-tipped fur and the markings that you'd like on him, otherwise it's too much effort to try and parse out details from the ref.
Also it looks like his tail isn't a conventional wolf tail...it looks more like a donkey tail? ^^U Would you prefer a regular wolf tail or draw it like in the picture?