Why did you not use the 3 mountains mural for the last mural section of the 2nd Hall? Could have been used with the rune mural bottom (crown and anvil symbol) instead of the corridor entrance. I think it would look better, plus it wouldn't bee necessary to remove the black part of the upper part of the penultimate mural section.
Also, I don't think the apparent endless stair mural looks good. It's too wide and I don't see logic behind the fact that the endless stair is represented and not the other underground parts of the Moria.
The under construction mural looks amazing, but I think that such an old part of Khazad-dûm would have been finished for centuries.