Need help with modeling a body with racemenu (butt)

[komenavos]

Hi, i'm trying to recreate this cosplayer https://mobile.twitter.com/rintohsakka on skyrim so bandits and falmers can have some fun, but i cannot recreate the butt

https://pbs.twimg.com/media/FKyAjTZVkAIZeJM?format=jpg&name=large

https://pbs.twimg.com/media/FIhz-4NUYAMHv_E?format=jpg&name=large

i have managed to make hips and chest, but the butt resist me because i dont find the correct slider, this is the result but im not happy because it doenst look accurate, could you please help me