Board Thread:General Discussion/@comment-27907368-20160509041606/@comment-27701762-20160509042944

It's the little hair/fur that sticks out of Asriel's head. You only see it on the right side from the back view, and nothing even remotely resembling something like a horn on the left, even the very base of one. It looks like a horn from the shadow profile, but rather than seeing it as something curving to the right, look at it as curving forward.