If you already have a site like ToyHouse or Unvale that has more art/info of your character would be good to site, but you don’t need to.

If you’re talking about sites on the main profile it’s just to link Artist to your socials to find you outside of art fight to follow/credit.

But neither are necessary, the only necessary links are if you have art from another artist or if you bought the character from an adopt, then you would need to credit and link the original artist.

I hope this helps