Cosplayer Xena Duncan transforms herself into a Twi’lek in order to become Hera Syndulla from Star Wars Rebels. She wore the costume at Celebration Orlando — and she really wore it. Xena was in costume 12 plus hours on multiple days. Since people have asked her about how she achieved the perfect green makeup look, Xena created the above tutorial video. She says:
This is a water-based tutorial, as I’m not a fan of alcohol based, but I promise you that I managed to get 12+ hours of wear out of this each day at Star Wars Celebration. Beyond the base-make-up and sealer, I mostly use every day beauty make-up which makes this fairly easy to do on a budget or using make-up that you possibly already have.
You can get a full list of products used in the description of the YouTube video.