I recently found some videos of Finfolk tails; some of the tails are very early ones they created. They're from two different renaissance festivals, Arizona and Minnesota. Most are from people walking through the exhibits. If it was a longer video, I used the link to when the mermaids start.

Arizona Renaissance Festival:

Sea Fairies Mermaid Tank:
https://youtu.be/1aRlEK4B9bM?t=1m51s

Tank:
https://www.youtube.com/watch?v=dWYug1EwH30

More Tank:
https://www.youtube.com/watch?v=Piw48Mq7_Is

More more Tank:
https://www.youtube.com/watch?v=88GfCTL_vgM


Minnesota Renaissance Festival

Drone video:
https://www.youtube.com/watch?v=SyzcoiqyRuI&t=119s

Attendee Footage:
https://youtu.be/sR9g9JI1qFc