In fact, during the restoration many walls were whitewashed, and this caused the loss of many frescoes inside the church.

However, some works remained like the precious Madonna of the Rosary between St. John the Evangelist, St. Dominic, St. Catherine and St. Cecilia by Andrea Polinori. Some other frescoes remained depicting saints including Sant'Antonio Abate and a Conversion of St. Paul  attributed to Bartholomeo Barbiani of Montepulciano and a 17th-century Madonna with Saints between Sant'Anthony of Padua and Santa Barbara.

Also worth noting inside the church are a 14th-century silver and enamel cross and two paintings, also by Polinori, depicting the Deposition and San Lorenzo.
 

Bibliography
Santini L. (1999),  Guida di Amelia e dell'Amerino, Perugia, Quattroemme Editore.
Caruso P. (1999),  Benvenuti in Umbria, guida ai 92 comuni, Collazzone, Grilligraf Editrice.
T.C.I. (2004),  Umbria, Milano, Turing Editore.