(Originais Teachy 2023) - Question Hard of Spanish

During a class of Spanish literature, a Brazilian student in the 2nd year of high school comes across a passage from a poem by Federico García Lorca and is challenged to reflect on the correct use of 'muy' and 'mucho' to express different degrees of intensity in her own compositions. Next, in the poem 'Romance de la luna, luna', the passage is presented: 'La luna vino a la fragua con su polisón de agua. El niño la mira, mira. El niño la está mirando. En el aire conmovido mueve la luna sus brazos, y muestra lúbrica y pura sus senos de duro estaño'. For the student, who is also passionate about poetry, it is crucial to understand how the use of 'muy' and 'mucho' could alter the intensity of the meaning expressed in the poem excerpt, considering the context in which the moon is described. Based on the analysis of the passage and the concepts of intensity in Spanish, what would be the most appropriate choice to replace or complement any part of the text without altering the original meaning of the poem, taking into account the distinct grammatical functions of the words in question?