Ok. I finally finished my concept (which I changed several times, because I didn't want to do things, that other people did).
Overall mask shape is inspired by "hat" of Ostrons. It has paper texture (like any other Nakkak's mask) and fabrics on both sides (I'd apreciate physics on it) which is pinned with those "clips" Ostrons have on their clothes. Those gold details would have metalic colours, paintings (inspired by those on buildings in Cetus) could glow in the dark.
mask - primary
fabric - secondary
details - tertiary (metalic)
paintings - suit energy
I hope It's not too complicated to visualize 😉