This guide is intended to help you find that last image - perhaps you ran past 
it somewhere, and you don't want to trawl through the whole game world looking 
for it. It is not entirely spoiler-free, but all I will include is the name of 
the room, and also perhaps the name of an adjacent room (because some rooms are
not easy to find).

I have arranged the images in rows and then columns.
For some rooms I have also in brackets noted a room from which you can reach it
 - this is because some rooms are very difficult to discover, and might not    
even be marked on your map as an unexplored route.

Another important detail is that the room name given here is the room from     
which the image is easiest to reach. In many cases, this is the end of the     
previous room, or immediately after it. Just keep in mind that if you go to the
room given here looking for the image, you may need to go backwards a little.  

NOTE: I originally created this guide on Steam and have uploaded it to GameFAQs


Row 1

1. (Start the game)

2. A Game Of Leap Frog (via Leap Of Faith)

3. Leap Of Faith

4. Now You See It

5. Many Paths To Nowhere

6. (Play the game for a while)

7. Into Darkness

8. Into Darkness

9. Down The Rabbit Hole

10. Many Paths To Nowhere

11. Many Paths To Nowhere

12. (Return to the menu room by pressing escape)

13. Many Paths To Nowhere

14. Strength In Numbers

15. Cry Me A River


Row 2

1. Don't Look Down

2. Climbing The Tower (Top) (via Breaking The Arc)

3. Four Different Exits

4. Down The Rabbit Hole

5. There's No Way In

6. (Exit Door) (via There's No Way In)

7. Skinning A Cat

8. I Can Do Anything

9. Not Enough Pieces

10. Learning To Draw

11. Hidden Secrets

12. Don't Look Down

13. Into Darkness (via Rings Within Darkness)

14. There's No Way In

15. Not Enough Pieces


Row 3

1. Cry Me A River

2. A Wall Without Stairs

3. A Game Of Leap Frog (via Leap Of Faith)

4. Taking Baby Steps

5. Connecting The Pieces

6. The Final Hurdle

7. Don't Look Down

8. The Final Hurdle

9. Three Paths In Sight

10. Running Into Trouble

11. Running Into Trouble

12. The Ground Floor

13. Stuck In A Rut (via Finding The Seams)

14. Stuck In A Rut (via Finding The Seams)

15. Strength In Numbers (only via Learning To Draw)


Row 4

1. Climbing The Tower (Level 1) (via The Ground Floor)

2. Not Enough Pieces

3. The Butterfly Effect

4. Stuck In A Rut (via Finding The Seams)

5. Climbing The Tower (Level 4) (via Pulling Both Ways)

6. Impossible Paths

7. Now You See It

8. Don't Look Down

9. Don't Look Down

10. Hidden Behind Glass

11. Taking Baby Steps

12. Strength In Numbers

13. The Highest Point

14. Red Cross (via Falling Forward)

15. Now You See It


Row 5

1. (Exit Door) (via Learning To Draw)

2. Climbing The Tower (Level 5) (via I Only Need One)

3. Learning To Draw

4. Learning To Draw

5. I Like To Move It

6. Many Different Angles

7. Logic 101

8. Skinning A Cat

9. Finding The Seams (via Three Paths In Sight)

10. Impossible Paths

11. Climbing The Tower (Top) (via Breaking The Arc)

12. Closing The Gap

13. A Wall Without Stairs

14. The Ground Floor

15. Climbing The Tower (Level 2) (via Learning To Draw)


Row 6

1. Being An Entrepreneur (can also be found at Red Cross)

2. Lighting The Fuse

3. A Link To The Past (via The Butterly Effect)

4. Link In A Chain Reaction

5. The Butterfly Effect

6. Jumping Through Hoops

7. Too Many Lasers

8. (Exit Door) (via I Like To Move It)

9. Rings Within Darkness

10. Too Many Lasers

11. Laying The Foundation

12. A Loop That Won't Close

13. Falling Forward

14. Climbing The Tower (Level 3) (via Hidden Behind Glass)

15. Breaking The Arc (via Stairway To Heaven)


Row 7

1. A Book And Its Cover

2. Many Different Angles

3. The Missing Pieces

4. Link In A Chain Reaction

5. Jumping Through Hoops

6. The Butterfly Effect

7. A Wall Without Stairs

8. (Visit ~20 rooms)

9. Climbing The Tower (Level 6) (via Just A Little Bit Shy)

10. The Final Hurdle

11. There's No Way In

12. Climbing The Tower (Level 7) (via Impossible Paths)

13. I Can Do Anything

14. A Book And Its Cover

15. Deja Vu


Row 8

1. Window Of Opportunity

2. Hitting A Wall (via Impossible Paths)

3. I Can Do Anything

4. Over The Edge

5. Many Different Angles

6. Many Different Angles

7. Deja Vu

8. Falling Forward

9. One Long Corridor

10. Connecting The Pieces (can also be found at Over The Edge)

11. A Jump Too Far

12. A Jump Too Far

13. The Chase

14. The Escape

15. The Escape