The big difference between Marcille and Shuro is that she recognizes the things that she loves in Falin are the same things that frustrate her about Laios. Shuro will list off the things he loves about one and hates about the other without realizing they're the same list.
the juxtaposition of falin’s eyes being drawn as “closed” when she was her own separate individual and her eyes being open when she’s being subsumed by the curse placed on the soul and flesh of the dragon and out of control of her actions