His background in construction is evident in his precise depictions of rigging and hulls. Unlike many marine painters who focused on dramatic storms, Groenewegen preferred the quiet activity of the Maas river. Works such as Gezicht op Rotterdam gezien vanaf de Maas and Uitvarende schepen bij Vlaardingen show a clear understanding of how ships actually moved through the water. He often used grey washes or fine line work to document the daily life of fishing boats and merchant ships.

These prints offer a window into the industrial identity of the Netherlands during the late eighteenth century. Collectors value his work for its topographical accuracy and its lack of romanticised drama. His scenes of the Oude Hoofdpoort te Rotterdam or Eendenjagers provide a calm, structured aesthetic for a modern room. The technical clarity of his maritime subjects makes them suitable for those who appreciate history and engineering.