According to one of his later students, Krock traveled to Italy in the company of young Ulrik Christian Gyldenløve, King Frederick IV’s half-brother.

The other cosigners were Wilchen Riboldt, Jacob Coning, Otto de Willarts, Georg Saleman and Thomas Quellinus, all court artists.

Beside his duties as a royal painter, he used the studio to teach drawing, and also as a meeting place for the artist society which he managed and provided with educational materials.

His position as royal painter was renewed in 1731; at that same time, however when the building of Christiansborg had begun, the preferred artistic style was quickly changing from Krock’s baroque to the new rococo-style.

And therefore, the idea of a Danish Art Academy, which could train native artists to decorate the King’s castles and palaces, became an important royal objective.

In 1731 he painted an altar piece portraying Christ on the Mount of Olives in St. Peter’s Church (Sankt Petri Kirke) in Copenhagen.

In 1738 Krock was named leader of Christian VI’s Art Academy along with sculptor Louis August le Clerc.

Leadership of the burgeoning Academy was taken over by le Clerc and Venetian history painter Hieronimo Miani after Krock's death.