The cathedral is adorned with sculptures of angels located on the attic story, angels with lanterns, evangelists and apostles on the portico pediments. The dome balustrade features 24 sculptures of angels and archangels by I. German, while the pediments show high reliefs of the Resurrection of Christ, Isaac the Dalmation Meeting Emperor Valent by F. Lemer, and the Adoration of the Magi and St Isaac Blessing Emperor Feodosiy by I. Vitaly.
The reliefs were cast in bronze at the Berd factory. A set of three or four figures were made in one casting. To avoid the shifting of the huge figures, they were enclosed in reinforcing wires held together with numerous dowels. This made it possible for figures to stay clear of the cornice without damaging the marble facing of the walls.
The niches of the north and south porticoes are filled with the statues Christ Carrying the Cross, the Lamentation, The Massacre of the Innocent and The Angel Appearing to the Shepherds by P. Klodt and A. Loganovsky.
The exterior of the great doors was designed by I. Vitaly, particularly noteworthy are the west doors showing the compositions The Sermon on the Mount, The Raising of Lazarus and The Healing of the weak.
