Hello. Can I not be tied to these drawing styles and offer my own (they will be suitable for tattoo size 3x4 inches) ?

Yes. I am not married to a specific drawing style. You are limited to drawing the character herself and may use color, but I would prefer limited use of color as this character lives in a world where volcanoes continuously erupt and her whole world is covered in ash and soot. There are nearly no plants as the sunlight being clouded by ash limits their growth. She also is always barefoot and has shoulder-length or shorter hair ??

Yes, I have already read about her life.

Awesome! I can't wait to see what you come up with! Have fun!