In 1882 he was commissioned by the German Wilhelm Spemann to illustrate the Ligurian and French coasts, from Nice to La Spezia.
In Bordighera, he continued to collaborate with German publishers, in particular with the magazines "Gartenlaube" and "Über Land und Meer".
One of his most beautiful paintings is undoubtedly the "Vallone del Sasso" now housed at the International Institute of Ligurian Studies (IISL).
He had the opportunity to exhibit his works not only in Bordighera, memorable was the one at the "Victoria Hall" in Via Vittorio Veneto,[4] but also in Turin and Germany.
[5] Nestel was a friend of the narrow group of intellectuals and artists who had so enriched the life of the Ligurian town, as Pompeo Mariani, Giuseppe Ferdinando Piana, Charles Garnier, Clarence Bicknell and of course the countrymen Ludwig Winter and Friederich von Kleudgen.