Quote - Acadia,

I dunno. It looks like someone morphed the foot into a high heeled shoe. That high heel looks like it emerges from the heel of the foot.

Probably post worked.

You could always contact the artist and ask them how they achieved that. 

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi