Artist's commentary
Glaucus atlanticus is a blue sea slug that lives on the surface of the Atlantic ocean. It's rayed cerata on each of it's 6 arms gives it the graceful appearance of a tiny bird spreading it's wings under water. They mainly eat jellyfish, including many types of highly venomous jellyfish. Though not naturally poisonous, they can store the venom from jellyfish they eat in the tips of their cerata, which can then use to deter other fish or animals from eating them.
I saw Irontom drawing monstergirls and was inspired.