I think I can make out 17 characters (including the two creators in yellow), or at least I know who their artists are. That includes at least 3 American characters. (I’ll add my guesses in comments, below)
This art was used as a poster for the Basel cartoon museum’s exhibit, last decade:
(right click as needed)
(original link)
Original image here:
https://piefed.social/c/eurographicnovels/p/1937271/tintin-tuesday-a-panel-from-the-blue-lotus
More on Exem:
https://www.bedetheque.com/auteur-4983-BD-Exem.html
OMG, she has that Winona Ryder look from ~1990, but I guess that couldn’t possibly be her to weirdly feature in BD art from that more general-oriented collection of BD.
WOW, that’s a good question!..
I’m thinking it’s someone I saw in “Drawn and Quarterly” or “Raw”, but that’s just a guess.
Her head is so oddly-placed, too?
Oof, I threw the Q over (kinda, sideways) to r/phroncoBD, and it’s been a huge feeding-frenzy so far:
https://www.reddit.com/r/BDFrancophone/comments/1t9a6xp/sur_laffiche_dexem_je_ne_sais_pas_trop_qui_sont/