A kawaii cute puffer fish swimming through the sea. This design started out life as a Mermay 2019 drawing challenge sketch, but I liked it so much I took the mermaid tail away added it to my designs.
Where you can buy online
You can find the design on t-shirts in most stores, but also on other products depending on the store (e.g. hoodies, mugs, stickers, notebooks, phone cases, greeting cards, cushions, socks etc).