It features a curious-looking Dory standing (or swimming) along a happy-looking Nemo! The billboard advertises that the Finding Dory party is currently online, and will be until August 17. It notes with a flashing headline that members can get 6 fin-tastic new costumes! with an image to support the claim.
I think the attention to detail is great for such a small form of media. Nemo is appropriately illustrated, with one broken fin, and pictured next to an anemone, a nod to the first film in which he had trouble pronouncing the name. I also appreciate the bubbles to give that true underwater aesthetic.
This billboard will be up until the party ends. I think it does a fitting job of correctly advertising the Finding Dory 2016 party to the fans, and I hope it draws penguins to log in and check it out.