He enjoyed high-level patronage in Rome as is demonstrated by the commission to decorate the Roman palace of Camillo Francesco Maria Pamphili.
His compositions were also admired by the Flemish animalier David de Coninck and the Italian still life painter Pietro Navarra, both of whom worked in Rome during the second half of the 17th century.
Their conclusions were confirmed by the presence of the monogram "JHF" (Joannes Hermans Fecit) on one of the paintings in the Pamphili Palace attributed to Monsù Aurora.
[4] An example of such a large-scale composition by Hermans is the Still life around a bust of Ceres of 1653 (Sold at Cambi Casa d'Aste on 15 March 2011 in Genoa, lot 1452).
In this compositions Hermans reveals the debt he owed to the works of the leading Flemish animal and game piece painter Jan Fyt.
The series of bird etchings by Pieter Boel, another Flemish animal painter who stayed in Rome prior to 1650 also appear to have been an inspiration for his work.
Garland paintings are a special type of still life developed in Antwerp by artists such as Jan Brueghel the Elder, Hendrick van Balen, Frans Francken the Younger, Peter Paul Rubens and Daniel Seghers.