The request is a picture of Sophia(ソフィーヤ). Sophia is a character from the "Fire Emblem" series.

• sophia reference images:

https://imgur.com/a/m3TCLO3

• She wears this bikini:

https://i.imgur.com/YCMujFB.png
However, she does not wear that white jacket.

• Give her this kind of breast size:

https://skeb.jp/@miyakoto10/works/5

• she has a calm facial expression.

• This kind of pose:

https://i.imgur.com/YCMujFB.png
Make sure her breasts and midriff(お腹) are visible.

• I leave the background to you.

• Her hair is very long. It's so long that it drags on the ground.

• Make sure that you include this part of her hairstyle

https://imgur.com/a/AnywtvK