Since the pose is very specific, I STRONGLY recommend you to use the following prompt structure :
This is not mine, the author is https://civitai.com/user/Notaledeji/models
1girl, sitting, feet up, soles, YOUR DETAILS, <lora>
Example : 1girl, sitting, feet up, soles, brown hair, blue eyes, white bikini, bedroom, lora:feetPoseAnime_v11:0.6