When do I use rostro or cara?

Question

It appears to me that "rostro" and "cara" mean the same thing-"face". Are there times or contexts that would better determine when to use one or the other, or are they equally interchangeable?

Answer 1

As inuyaki said, rostro addresses more abstract concepts such as emotions.

su rostro triste Her sad countenance.

Answer 2

"rostro" is a more intimate word used to describe or talk about someone's face whereas "cara" is more like the actual anatomical structure that is the face.

Answer 3

"rostro" involves abstract concepts and "cara" physical aspects .