Their general intonation is strong and brown, and effects are rendered in a powerful key, but the execution is much more uniform than that of Jacob Ruisdael.
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This can be seen in the development of Isaac van Ostade, who abandoned the genre techniques of his brother Adriaen van Ostade for the broader landscapes of the Ruisdael family.
He also learned to admire the masters of the Dutch and Flemish schools (Rubens, Hals, Rembrandt, Ruisdael), imitating their loose and vigorous brushstrokes.
Isaack van Ruisdael (1599–1677), Dutch Golden Age landscape painter, father of Jacob (few works known)
Very few works are known today by Isaack van Ruisdael, but he is known for landscapes in the same style as his son, and there is a view of Egmond and a view of Muiderpoort in Weesp in the RKD.