Fabulous!
Thank you for sharing. I do so much on Procreate now! It’s often easier for work that is going to be reproduced because I don’t have to worry about scanning it.
This brush is one that replicates a Leonardt Principal. It’s by
InkedHandStudio on Etsy. It is my Go To for sure.
I have Yamocreates brushes as well.
I also do some brush calligraphy on ProCreate but usually do more Copperplate or Spencerian.

Gotta love the undo button! ProCreate is such a great way to practice and, especially, do layout without wasting a lot of paper and ink.
Your Spencerian is fantastic!