Test with both sides inflated.
I used Adobe Photoshop 2021 and Meshmixer to convert the flat 2D public domain image into a 3D model.
[Glass pendant in the form of a dolphin](https://www.metmuseum.org/art/collection/search/249692?searchField=All&sortBy=Relevance&deptids=13&ao=on&showOnly=openAccess&ft=pendant+in+the+form+of&offset=0&rpp=80&pos=11) via The Metropolitan Museum of Art is licensed under CC0 1.0