Yeah I think technically "Lady Amalthea" is only the name given to her human form and she's only known as "the unicorn" otherwise but that's so ambiguous I figured to use the name they gave her during their stay at Haggard's castle.
I can totally see the Unicorn Tapestries inspiration, but the color palette of your work brought The Last Unicorn to mind. Looking forward to seeing the finished product <3