This One Book Lover

Mor stayed overnight, even going so far as to paint some rudimentary stick figures on the wall beside the storeroom door. Three females with absurdly long, flowing hair that all resembled hers; and three winged males, who she somehow managed to make look puffed up on their own sense of importance. I laughed every time I saw it.

It could be Feyre, Mor and Amren with Rhys, Cassian and Azriel but... Amren's hair aren't long. Amren has a very distinct, shoulder-length chin-bob. Amren’s hair is never described as "absurdly long and flowing." At first glance, we assume tha with the "resembled hers" means the hair resembled Mor's hair. But what if this "resembled hers" doesn't goes for Mor's hair but for Feyre's? It's a first-person POV, Feyre just assumed that those three females' hair resembled Mor's as she is the one who drew them. What if Feyre understood wrong? We only know that the females' hair are "absurdly long, flowing", we don't know their color. In ACOTAR (Chapter 2), Feyre explicitly describes Elain's hair as "the hair all three of us had." The three sisters share the exact same long, flowing hair texture. Ιf you think about it there's a high possibility that Mor didn't draw Feyre, Amren and herself with the Batboys but the Archeron sisters with the Batboys! And as @meglap15 said, if Mor wanted to just paint herself with Az, Cassian and Rhys why would she paint 3 of herself with them and not just one Mor and the 3 batboys?

But why?

We know that the first time that the Batboys were with the Archeron sisters at the same room was on Chapter 24 of ACOMAF which sets up the foundational dynamics of Nessian and it also provides early crumbs for Elriel. But Mor wasn't on Chapter 24. Mor was at the same room with both the Batboys and the Archeron sisters on Chapter 40. Reminder that the quote above was from the Chapter 53 of ACOMAF.

Before I continue... What do we know about Mor?: We know that to create Mor, SJM took inspiration from The Morrígan. The Morrígan is a powerful figure in Irish mythology, mainly associated with war and fate. We also know that Mor possesses the elusive magic of truth. She can detect lies, sense hidden dangers or weaknesses, and manifest an aura that compels others to speak or recognize the truth.

So, the timing of when Mor paints this on the cabin wall is everything. It happens right after Feyre runs away to the cabin upon discovering she and Rhysand are mates, but before Nesta and Elain are taken by Hybern and shoved into the Cauldron. At this point in the story, Nesta and Elain are still mortal human women living in a distant manor. Mor possesses the elusive magic of truth and is inspired by a goddess of fate, so her drawing is not just a silly doodle but a subconscious manifestation of destiny. As the embodiment of truth, Mor’s magic might instinctively recognize the alignment between these two sets of three siblings. She can see the inherent, ultimate truth of how their lives are meant to intertwine, even before the characters themselves realize it! Tying back to her roots as The Morrígan (the weaver of fate), she is mapping out the future of Prythian on that wall. She is drawing the three brothers paired with the three sisters.

During Chapter 40, Mor wasn't just sitting there. Her truth magic was actively running on high alert to evaluate the human queens. But while observing the room, her magic likely picked up on the blinding truth of the dynamics between the siblings right in front of her! She would have sensed the spark between Cassian and Nesta. She would have felt the gravity pulling Azriel toward Elain. And Feyre with Rhys? Come on! Even Cassian realized that they are soulmates! CASSIAN!

When Mor finally gets a moment of downtime at the cabin in Chapter 53, that overwhelming instinctual data pours out of her. Because she isn't a trained artist like Feyre, she can only express this heavy, prophetic truth through rudimentary stick figures.

By framing the three Illyrians as "three winged males, puffed up on their own sense of importance," she hides a literal prophecy behind a joke, masking her staggering power.

Mor stayed overnight, even going so far as to paint some rudimentary stick figures on the wall beside the storeroom door. Three females (Feyre, Elain, Nesta) with absurdly long, flowing hair that all resembled hers mine; and three winged males (Rhysand, Azriel, Cassian), who she somehow managed to make look puffed up on their own sense of importance. I laughed every time I saw it.

Guys, I think that I just gave you one more reason to love Mor!