Hermoso was a student of Gonzalo Bilbao and José Jiménez Aranda in Seville. He moved to Madrid in 1901. In 1904, he won the bronze medal at the National Exhibition of Fine Arts with La muchacha haciendo media,[2] which was acquired by the Museum of Cádiz. His painting of "some rosy-pink peasant women carrying pumpkins and chickens and seen against the background of a setting sun" won much acclaim.[3] He lived in the same place for several years with Daniel Vázquez Díaz. Together, they had attended classes taught by Jiménez Aranda in Triana, Seville. In 1905, he exhibited El Colegio e Hijas del terruño at the Exposición del Círculo de Bellas Artes which was praised by Francisco Alcantara and José Francés and also traveled to Paris and Brussels. In 1912, he exhibited at London.