Shark model for axolotl mob in 1.20

I found an old small resource pack which changes dolphins into sharks. I was already planning to add sharks to the game with using data pack/resource pack combination but I want sharks as an aggressive mob. Dolphins are not attacking players and fishes and that's why I want to change the model from dolphin to Axolotls. But when I tried the change it, the model is going to break and it does not work. If you help me for to fix the model, I will be so happy. Thank you...
The broken models