After picking up the Experiment Block Key, an Afflicted will bust out of one of the doors, the drawing is inside the door to the left of the ladder. If the Afflicted came out from the door on the right side, choose to retry from the main menu.
On the PC version, the Afflicted will always spawn from the door the player approaches first, so simply walk to the door to the left of the ladder after picking up the key.
In the room where Moira gets the crowbar, to the right of the blue door.
Immediately upon starting the episode, before interacting with the first door, look up instead.
Inside a bedroom, the drawing is on a large painting to the left of the bed, it's smaller than usual.
After pushing the small aquarium inside the same bedroom, the drawing will be on the floor where the pushed object was.
In the same area where the Workbench is located, go the right side. The drawing is on the wall.
After going outside the Tower and a coutdown starts, follow the path to the right and the drawing will be directly in front of the player.
In the final area of the chapter, large debris will fall, including two ladders that fall horizontally which open up a new path to the player. Upon steping on the second ladder, look left and the drawing will be on the wall.