He exhibited in Rome for the first time in 1893. In 1894 he won an artistic stipend with Un Ritorno dei naufragi. With this award, Coromaldi travelled to Paris, Brussels, Antwerp, Monaco, and, in 1895, he exhibited in Stuttgart, where a pastel, "Il cenciaiolo". On his return to Rome, he began his most prolific period. He consistently participated in annual exhibitions of the Society of amateurs and enthusiasts, where he became a member and had several one-man shows. In 1903 he was present at the Venice Biennale. He continued to exhibit at the Biennale until 1924, when he displayed La donna e lo specchio . In 1905 he joined the group of "twenty-fifth of the Roman Campagna". In the same year he was one of the illustrators, along with G. Balla, D. Cambellotti and others, the volume of E. De Fonseca, Roman Castles, published by the brothers Alinari in Florence. In 1909 he succeeded his mentor, Prosperi, teaching figure drawing at the Institute of Fine Arts. Rome International Exposition in 1911 the artist participated, as well as a Lancellotti, with a series of panels that made up the figurative decoration of the pavilion of the fishery. He was a master of painting at the Royal House and in 1911 painted a portrait of King Vittorio Emanuele III. Coromaldi was prolific and successful, exhibiting: Sea bass ; Happy Mother ;I Frattaroli, and In the Hut ;, 1908, purchase of the painting The meal time In 1909, 1910, 1911, he won awards in Munich, Brussels, Barcelona and Santiago, Chile; in 1912 at Naples for The devotee ; and in 1915 at San Francisco for The Bass. From 1912-13 he continued to paint subjects with figures. The quantity and quality of his production decreased in later years, the number of works, from the second decade of the century, he devoted himself more and more exclusive pictures of animals. Coromaldi was president of the Academy of San Luca in Rome and member of the Brera and Academy of Parma. The picture that marked the success of Coromaldi "Ritorno dei naufraghi ", is a work in composition and technical performance that refers explicitly to the art of Francesco Paolo Michetti. Works of Coromaldi are exhibited in galleries of modern art in Rome, Florence, Milan, Palermo, Accademia di S. Luca in Rome; Revoltella Museum in Trieste.