Your description of Troyon and Rousseau, for instance, is lively enough to give me some idea of which of their manners they are done in. There were other paintings from the time of Troyon's municipal pasture that had a certain 'mood' that one would have to call 'dramatic', even though they aren't figure paintings.
Notes from Wikiquote
At the exhibition 'Les cent chefs d'oeuvre' at Galerie Georges Petit - in Paris, 1883 there were 9 paintings of Troyon. Vincent had asked Theo in Paris to give him a description of the works at this exhibition. Vincent already appreciated Troyon's painting style, which he knew from his Paris' years at art-gallery Goupil where he worked