"What are calluses?"

She throws the question with a star.

The big foot has long toe nails and hairy heel. I presume she wanted to depict dead skin.

The pinky toe is relatively larger than other toes.
This is her desire of larger pinky toe, since she has a small one.

And take a careful observation on the thumb. Nice and big and it is angled, as if it is leading the group of rest of the toes, perhaps for a soothing pedicure session. Clear depiction of leadership it is.