What would your scary thing be?
Dark, lankey, thin corridors.
And while not many people find the Renderman add-on all that brilliant, with a proper map, it sure can be frightening, especially when it peers at you from the corner and disappears without word.
I would love to make a map based around its functionality that is purpose built, and put in more ominous, and less sharp sounds, so you don't know if what you're hearing is happening because of the map, or because of this creepy dude trying to find you.
I would also remove the big smile, and just replace it with the default BL face so it would just be a completely shadowy figure.