Thank you for your feedback, and I am glad you liked the art. ( I worked on Death and Magician's art and character design)
Right now, the other Major Arcana, do not have any definitive animals listed to represent them. I do know that for the "Lovers" Major Arcana, I wanted to do a bird species that mates for life, but are not associated as the symbol of the perfect romantic relationship, like penguins, Geese, cormorants, and Hornbills.
I was also considering Unicorns for the "Lover" as Unicorns always felt like romantic creatures. For "Death," I was thinking of using wolves instead of/alongside crows, as wolves and ravens work together to hunt prey, symbolizing "Death" and their crows' partnership. I dropped the wolf motif for "Death" as I felt like their design would be too busy/ too animalistic.
I do know that the more conceptual the Major Arcana (like Judgment and Temperance) would be more eldritch/otherworldly, probably using less animal inspiration and more botanical (especially through Floriography).