I got my completed towel back! Here it is in all its glory:

And here's a rundown of everyone's stitching. First up, my initial design:

Here's an adorable Nemo fish from IamSusie:

ritapizza stitched a beautiful mermaid:

This coral made entirely of french knots by Kitten Wrangler feels amazing!:

Another awesome sea plant courtesy of PearliePie:

And SarahJ2001's contribution is this cool seahorse:

Thanks to all of the Sassy Stitchers for making my first tour so enjoyable!