Answer:
Neoclassical - 1.) Began in the 1760's, but did not reach its peak until the 1780's and 90's. 2.) Focuses on ideas of harmony, universality, and idealism. 3.) Artists include Joseph-Marie Vien, Pompeo Batoni, and Gavin Hamilton.
Romanticism - 1.) Spaned mainly from the late 18th century to the mid 19th century. 2.) Romanticism played with imaginative, emotional, and trancidential ideals. 3.) Artists included Percy Bysshe Shelley, Konstantin Makovsky, and Anne-Louis Girodet de Roussy-Trioson.
Realism - 1.) Mainly portrayed real life, customs, middle and lower class, and ordinary people. 2.) Was not consciously adopted until the mid-19th century. 3.) Artists included Gustave Courbet, Augusta Savage, and Adolph Menzel.