It's recommended to use this model at 0.65 level with these prompts (or look at the examples I've done):
((smile)), (creature name here) with a very happy face,

And then don't forget to add a background, like fire or fireworks or anything else you feel it would fit, I recommend Supernova Light Style lora.

Trained from 1 picture of Izzy, a cat somehow famous because of its expressive face, that's why if you just generate an image without any loras or prompts you will get the raw image of the cat, but as my examples demonstrate you can go as far as making dogs or rabbits.

References:

https://www.instagram.com/izzyandthefluff/

https://kittykittene.com/meet-izzy-the-cat-whose-expressive-face-says-it-all-thi/