This is one of the things I have been working on. It uses vectors from these respective artists: Shoxxe, Alandssparkle, an anonymous artist from Derpibooru, Charliexe, and Jacob Van Antwerp. Some of the rocks are from some of Shoxxe's Equestria Girls pictures; except stretched or squished a bit. I created the buildings. I also gave some of the vectors some bathing suit edits. You may have noticed that there are 2 Bon Bons here, that is because I had trouble deciding what bathing suit color suits her. I also created vectors for some of the undersea creatures. I mention this because some the undersea creatures are from Shoxxe's Equestria Girls pictures. I will later present parts of this art piece in closer detail soon. Feel free to like and comment.

The poses for Sci-Twi, Sunset Shimmer, the rest of the Hu-mane 5, Octavia Melody, Lyra Heartstrings, Trixie, Watermelody, some of the fish, the turtles, the seahorses, and the Dazzlings belong to Shoxxe, as well as the outline for some of the rocky ridges.
The pose for Twilight Sparkle belongs to Alandssparkle.
The pose for Moondancer belongs to an anonymous artist from Derpibooru.
The pose for Starlight Glimmer belongs to Charliexe.
The pose for Maud Pie belongs to Jacob Van Antwerp.
The Bon Bon modifications and portions of the background belong to me.
My Little Pony:Friendship Is Magic belongs to Hasbro and Lauren Faust.