As Gm9 pointed out there is some missing information. You actually missed an entire hallway. It's a secret passage that leads on from the secret room off the blue vision room. I have noted down points on the hallway so you can easily find it's entrance in the image I attached.
1. This is accessed via a candle stick I believe.
2. This is accessed via a banner hanging over the middle of the wall. You'll need to jump.
Hope this helps.. and by the way.. I love the Map. It looks awesome, both the line detail and the colors you used are magnificent.
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