1. Right as you enter the lighthouse, stuck to the pole in the middle of the room.

No ink drawings to be found in this area.

2. In the pillow fort, stuck to a chair in the upper left side.
3. A bit further down the path, the drawing lies on one of the larger bookcases.
4. In the room fragment with the fireplace.
5. Lying near the root of the grand oak, to the right. Pick it up before going to the swing.

6. By the large skull with the candles around it.
7. About halfway up the mountain, find it stuck to one of the two totems.
8. On a rock when going just a few steps to the left on the shoreline.
9. Going a fair bit down the shore to the right side, it is pinned to a piece of machinery.
10. On the ship, right under the mast.

11. On the right wall directly after entering the prison area.
12. In the cell with the treadmill, next to the electrical box.
13. Lying next to the de-masked husk on the level above.
14. Going further up, find the ink drawing next to a broken cell door.
15. All the way on top of the tower, it is opposite from the side where you emerged from. Pick it up before interacting with the demon.

16. About halfway down to the battlefield, it is on the left-hand side near one of the red crystals.
17. Stuck to one of the prominently placed tanks on the battlefield.
18. Advancing through the battlefield, turn left just before the stairs and go all the way to the end. Find the ink drawing next to a destroyed trebuchet.
19. At the foot of the stairs, hard to miss.
20. The final ink drawing will be visible just as you ascend the stairs.