In Friar Alonso de Sant Tomàs, we see a solemn figure dressed in a brown robe, indicative of his monastic life. The background is dark, which contrasts with the warm tones of the friar's attire. His face is expressive, capturing a moment of contemplation or prayer.

The use of light highlights his features, drawing the viewer's attention to his thoughtful expression. The painting is executed in oil on canvas, a common medium during the Baroque period. The artist employs chiaroscuro, creating depth and volume in the figure. The details in the fabric of the robe and the friar's facial features are meticulously rendered.

This attention to detail is characteristic of Juan Bautista Maíno, who was known for his realistic portrayals. Juan Bautista Maíno was a Spanish painter active in the early 17th century, often associated with the Baroque movement. This portrait reflects the religious fervor of the time, emphasizing the importance of spiritual figures. An interesting fact about this work is that it was commissioned for a monastery, highlighting the connection between art and religion in Spanish culture.

Maíno's works are less known compared to his contemporaries, making this piece a significant example of his talent.