Just finished this sculpt of a gymnast! I wanted to focus on body shapes and form. I purposefully selected a character with very little clothing or accessories so there were less distractions ! 
More images can be seen on my Artstation page for this project
https://www.artstation.com/artwork/XnbZ6Y
This piece is based on this lovely 2d art by SamDoesArts
You may try softening her left feet (bend) in your 3D version…I know… easier said than done 