I’ve wanted to make my own for a while, and just when I was making plans to use my blue scrap yarn, I got some custom orders for amigurumi dolls and a mermaid tail!
Yarnutopia has taught me a lot about crochet, so I’m considering this pattern, but I really like this video,

except it is in Japanese!

Here’s another video tutorial, she has two on her channel and I like this one because the shell stitches flow downward, the scales come down .