This is the 1748th most frequent Spanish word.
marta
"Marta" in Spanish can refer to a female given name ("Martha") or a type of animal, the "marten," which is a small carnivorous mammal.
In this sentence, 'Marta' is used as a proper noun, serving as the name of a specific person.
Marta es una amiga muy especial para mí.
Marta is a very special friend to me.
Here, 'marta' refers to a common noun, designating a type of small carnivorous mammal found in natural habitats.
La marta es un animal que vive en los bosques.
The marten is an animal that lives in the forests.
In this instance, 'Marta' identifies an individual who is presumably the creator of the painting, again as a proper noun.