In 1929, Piotr Belousov met with Brodsky and by his invitation comes to Leningrad to continue his study. He engaged in drawing and painting under Brodsky leadership, as well as in the studio AKhRs and the Community of Artists.
In 1933, Piotr Belousov entered at the first course of painting department of the Leningrad Institute of Painting, Sculpture and Architecture. He studied of Mikhail Bernshtein, Pavel Naumov, Alexander Lubimov, and Vladimir Serov.
In 1939, Piotr Belousov graduated from Leningrad Institute of Painting, Sculpture and Architecture in Isaak Brodsky warkshop together with Aleksei Gritsai, Lev Orekhov, Mikhail Kozell, Gleb Verner, Elena Skuin, Nikolai Timkov, Boris Sherbakov, and other young artists. His graduation work was history painting \"On the eve of October Revolution (Meeting of Lenin and Stalin)\".
Since 1930 Belousov has participated in Art Exhibitions. He painted genre and historical paintings, portraits, landscapes, worked in easel painting and drawings. Most famous for his portraits and historical paintings devoted to image of Lenin, the history of Bolshevism and the October Revolution in Russia. His personal exhibitions were in the city of Vologda in 1959, and in Moscow in 1982.
Since 1940 Piotr Belousov was a member of the Leningrad Union of Artists. In 1939–1989 Belousov taught painting and drawing in the Repin Institute of Arts. He was Professor and Head of Department of Drawing since 1956. In 1970 He was awarded the Honorary titles of the Honored Artist of the RSFSR, in 1978 - the Honorary titles of the People\'s Artist of the Russian Federation (1978). Also Belousov was elected Corresponding Member of Academy of Arts of the USSR (1979).
Piotr Petrovich Belousov died in Leningrad in 1989. Paintings by Piotr Belousov reside in State Russian Museum, State Tretyakov Gallery, in Art Museums and private collections in the Russia, Ukraine, England France, in the U.S., and throughout the world.