These are the costumes for Undine's family: her sisters Merline and Selusine, her father King Triton, and her mother Queen Pearl.
The sisters are all unique in their personality and colours. Merline being more bookish and feminine, with Selusine being more sporty. I quickly sketched Queen Pearl because we already knew we were going to recycle a wedding dress I had already made the previous year for a shibori project. Please forgive Pearl's awful hands.
Triton is kinda of a cool surfer beach bum dad. He also carries the token colours fo each of his daughters. Coral pink for Merline, Wine and Cyan for Selusine and Chartreuse for Undine and Pearl.
Also not visible: Selusine's pants have a flap inside of them of stretch material similar to a skydiving / skysurfing bodysuit to make her outfit more fishy.
Thanks to *robhas1left
for the background.