This is the 1198th most frequent Spanish word.
rostro
Face.
Here, 'rostro' refers to the 'face' as the physical feature that can express emotions, specifically carrying a smile in this case.
Ella siempre lleva una sonrisa en su rostro.
She always carries a smile on her face.
In this context, 'rostro' is used metaphorically to describe the 'face' or surface of the mountain, emphasizing its visual appearance.
El rostro de la montaña se veía majestuoso al amanecer.
The face of the mountain looked majestic at dawn.
Here, 'rostro' is used to denote 'face' as a medium for expressing feelings or emotions, highlighting its reflective purpose.