[SPOILERS] Need some help with late-game puzzle.

[Rarecoil]

Hello, I believe I'm in very late-game right now: After the family core puzzle. (the atelier draft maze.)
I've noted paintings, lanterns, maze ends, notes inside mora jai boxes, rooms and the black paintings (if I didn't count wrong there're 25 of them, without duplicates 16).

I spelled out some words and found 41/45 letters but struggling with Foyer/Gym/Den/Trophy room's paintings.
I can somewhat guess what the whole thing looks like but I'm not sure I have any idea how to proceed beyond this point. I suspect it has something to do with "prism" clue and the only blue lantern near the entrance, black paintings, 4 imcomplete words in the gallery, but haven't found anything looks like the "answer" at the point.

I'm still trying but, does it require heavy guesswork or moon logic to even proceed from this point? Because if so I'm not sure I want to continue solving this on my own... If someone knows please do tell does "the solution" become somewhat clearer once you figured out the whole thing?

If it is relatively doable, some directions or hints on the missing letters I'm struggling with would be appreciated. Thanks.

[The Elk]

This is a really hard puzzle but is doable. Happy to provide more details if you want.

Overall goal:
You are trying to find the correct path through this area. Sorry if this obvious.

Mora Jai Hints:
Progressively move detailed.
Have you mapped out the sentence?
Can you match the lantern colors to the message?
You have already found the starting point.
Strong hint: Alternate solution: Have you seen anything similarly phrased before?

Picture Hints:
These rooms are absurdly hard. I only got one of them but forged ahead.

Foyer
Think about another name for a book and when you’d see that kind of tree.

Trophy Room
What is the boat doing? The case/box is something you’d take to school or work every day.
Stronger hint: You’ve seen the case/box in the Gift Shop.

Den
What is happening with the line on the chart? Can you think of other words for spear?

Gym
When do you get a medal like that – what did you get? Don’t overthink the second picture – it is what it seems to be.

Alternate route:
You can ignore this but thought it may help.
Have you found the not true paths?
Does the atelier gallery make any sense?
Stronger hint: Count the letters and the number of rooms you go through for the first hint in this section.

[Rarecoil]

Thanks that was helpful I think. Hopefully it'd help someone else stuck on the same place.

Although now that I think of it I still don't get what the 'Black' ones are about. Are they even relevant?

[Gorlom[Swe]]

what do you mean by black paintings?
is it the paintings pairs, "with and without"?