[The streaks do look long enough for something to have been dragged at some points, though they're very partial and smeared in places -- you could guess that they might be a trail, since there's some at the doorway between the banquet hall and the salon and there's also more of them further in the salon nearer to the gallery.

And no, there isn't enough blood here for a head severing. Just the small puddle under the chandelier itself.]