Hornets nest that formed around the face of a wooden statue that was left in a shed

NightmareSubstance.

Or there's a body under there....

Nah dude that's a demon building a new body

Pompeii (79 ad, colorized)

Wasn't this a scene in the haunting of hill house?
Edit: nvm, the one in the post is better
http://i0.wp.com/www.indiefanboy.com/wp-content/uploads/2018/10/haunting-wasps.png?w=932