When the restoration work of the Monastery started, before its opening to the public, a great collection of pictures of mainly religious themes was found all over inside it, samples of Peruvian painting during the viceroyalty.

About 400 pictures were restored or "refreshed" to make them recover their original aspect. The work of expert hands has recovered for present day observers a collection of great historic and artistic value.

The main pictures are shown in a majestic stage: two immense rooms with high vaults, in the shape of a cross, from which the plaster has been removed showing the walls made of sillar. At the side there is another vault, a smaller one, completing the architectonic unity of the Museum.

In the Picture Gallery we can see one of the most important exhibits of the religious art of the Continent. Besides, there is a numerous collection of paintings of the so-called Cusco School of Painting, the maximum expression of the blending of the feelings and values of two cultures: the Inca and the Spanish. The Indian artists from the XVI to the XVIII centuries achieved an extraordinary artistic ability in outstanding paintings of religious inspiration, made famous by the originality in their style, profundity of expression and the use of gold in its finishing.