While I was browsing pictures of narwhals on google images, I came across a narwhal anthro that had a horn coming out of her head. I was incredibly annoyed by this, since their "horns" are actually their left incisor that comes up through the jaw and upper lip.

So I doodled these at work. The female one is fairly young, that's why her coloring is so dark and her horn so short.

Fun fact: a small percentage of female narwhals have horns.