GET. THE MERMAN. OUT OF THERE.
How this flew under my radar is beyond me because I swear I had a Google Alert set for Ariel related cosplay, but I'm kidding -- I'm not 26 anymore and I'm way past that. This is a series of girls cosplaying as Ariel and her mermaid sisters all shot by Lunnaya Nadejda (aka DeviantARTist Usagi-Tsukino-krv). I posted several of the group shots after the jump, so imagine those are the appetizer, then check out her DeviantART page for the metaphorical main course. Or the actual main course -- who knows, maybe you're a monster that eats websites.
Hit the jump for several more, but be sure to check out Lunnaya's DeviantART for a ton more of the mermaids individually, and of everything else (Sailor Moon, Jessica Rabbit, etc. etc. etc. etc. etc. etc. etc. etc.)
Thanks to Sarah G., who heard a lot of 3-hour boat tours won't allow anyone cosplaying as a mermaid aboard because mermen will throw themselves on deck and then dry out in the sun. They're endangered you know.