Illaoi was released 2 years ago in League of Legends, along with her Void Bringer Illaoi skin. Since then, she has not received another skin and Riot has finally decided to show some love to her as she will be receiving one very soon. Riot has given Summoners a choice to vote for one of the three concept art for Illaoi and the art with most votes will be the next skin for Illaoi.
"We’ve been looking at skin options for her for a while now, and along the way realized there was a wide range of fun directions we could take. We narrowed the list down to the ones we’re most excited about, but this time around we want to leave the final call in your hands. Vote on which skin you want to see us create, and after the winner is announced, we’ll be updating you regularly on its development," Riot DRPH8 posted in the League of Legends Nexus.
The names and design of the skin is not finalized yet as all of it are still concept. Simply create a League of Legends account (it is different from a Garena account), and head over to this page to cast your votes. Remember, the next Illaoi skin is in your hands.