I've made my choices, but I'm leaving this up because I'm lazy :p
So I have a backstory and a personality and everything for my antagonist, but I can't decide a few things about her appearance. I know how she'll look in her Mermaid form and her human form, but I don't know about her Idol form. Or her Pearl. Yep.
These are the two color schemes I had for her Pearl. I might end up making the greyish black on the left Pearl a bit lighter though.
And these are what I had for her Idol.The green of her hair would be darker of course, but I still can't decide between the two :p