He soon demonstrated artistic skills that he cultivated as an autodidact in the local area, signing, in 1661, an altarpiece destined for a chapel near Montagnaga di Pinè.
Trained on the works of late sixteenth-century Venetian painters, Alberti had the opportunity to enrich his artistic education by assimilating the colored heritage of Titian.
In 1688 he started working on the frescoes The Triumph of the Faith and Minerva who Chased the Vices to Hell in the two rooms on the first floor of the new Giunta Albertiana, built to connect the Palazzo Magno to Castelvecchio.
Both allegorical paintings, in which Alberti seeks spectacular effects described as “looking from beneath”, follow the similar cycles frescoed by him in Palazzo Leoni Montanari in Vicenza.
In this last stage of his artistic activity, Alberti is undoubtedly credited for having laid the foundations for the birth of the so-called "scuola fiemmesa" (the Fiemme Valley school of art).