After numerous searches for expressive means ever since he was a student, Giallinas finally turned to watercolor, which he took on almost exclusively, thus evolving into one of the top Greek watercolor painters, establishing a school of his own in his specialty. Painting mostly landscapes (seascapes; ancient Greek, Byzantine and Oriental monuments; neighborhoods, etc.) but also genre themes, he created poetic images which reflect a classicistic-romantic perception and are characterized by the balance of composition, the special diligence in rendering details and the sensibility in conveying color gradations. Taking advantage of the properties of watercolor, Giallinas delivers his landscapes in an impressionist style, opting for soft tonal transitions. The landscape of Corfu is idealized, appearing almost sublime.