The best european models were referred to the interior design of the church, which includes a copy of Michelangelo’s Pieta, copies of El Greco’s work, the image of Our Lady of Czestochowa and The Immaculate Conception after Murillo. The whole is complemented with painting decoration: the image of the Adoration of the Mystic Lamb on the vault in the apse, and two historical scenes of national character on the chancel arch – the defense of Jasna Góra and the wedding of St. Hedwig and Władysław Jagiełło.