firefly headcanon: kaylee and inara have tried to get river to do makeovers with them but all she wants to do is use the makeup for painting. they don’t mind and tell her they love her art. she replies that she loves theirs too.
one day kaylee is doing her mechanical stuff and she’s covered in engine grease. river passes by and says “I love your art”. kaylee laughs it off but she can’t stop smiling (even more than usual) for the rest of the day.
the three of them start using it more widely as a compliment and affectionate statement.
after fighting the reavers in serenity, river asks the others if they liked her art. they all laugh until they cry.