If you are using base anima you may want to add a lora or an artist to control the style, if not is gonna have a wide range of results.

IF you have any doubt about how to use tags on anima check my guide:

Anima prompting (Natural + Tags) with LORA | Tensor.Art | Tensor.Art

Fate Testarossa Harlaown & Takamachi Nanoha Exceeds Version

Nanoha: brown hair, side ponytail, purple eyes, white shirt, blue necktie, jacket

Fate: blonde hair, long hair, red eyes, white shirt, purple necktie, jacket