Edit: Continuing with the extended TL notes on the 2nd page of this arc (post #4525480)...
Added annotations for the Noh masks the elders are wearing. Those masks have a lot of implied "symbology", both in the general case and in this current arc of the comic in particular.
The three elders wearing the masks have different speaking styles. They all sound, well, elderly, but Okina-mask sounds even older than the rest, while Ko-omote sounds vaguely feminine. Daikoku-mask, meanwhile, sounds like the straight man, with a tiny hint of wisecrack. This also happens to fit with the Noh theater role of their respective masks.
There's also another Noh convention at play. Facing upwards or towards the light with a Noh mask "brightens" it, and is generally associated with happier emotions. Facing downwards, away from the light, meanwhile "clouds" the mask in shadow, and is thus associated with sadness or other 'negative' emotions.
Further Details:
On post #4525480, the elders start off with their masks pointing towards the light. They are currently praising Shinzou. Daikoku further raises his mask in an (presumed) attempt to appear friendly while questioning Shinzou's love life. The artstyle also further emphasizes the 'smile lines' on the Daikoku mask.
On post #4525481, the elders lower their heads, pointing their masks down. They are currently nonplussed after listening to Shinzou's statement. The artstyle further supports this by emphasizing their 'frown lines'. Ko-omote in particular also has her mask tilted at an angle, with what can be presumed to be a questioning expression (on top of the troubled, "clouded" look the other elders are giving off).
On post #4525482 (this page), the elders' heads remained lowered, but less so compared to in post #4525481. The artstyle no longer emphasizes the frown lines, so overall they are giving a "ruminating" expression. Ko-omote's side profile here can also be interpreted as a "knowing" look.
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Anyway, as a side note, I have Hata no Kokoro to thank for encouraging me to look further into Noh some time ago, so as to better understand the 'expressions' she makes. A lot of artists also use similar Noh conventions when depicting her 'emotions', whether intentional or not.