He was noted as a painter of trompe-l'œil, decorative landscapes and classic ruins, somewhat in the style of Canaletto, but without his delicacy of touch; he appears also to have been influenced by Nicolas Poussin[1] and Gaspard Dughet.
[2] While young Rousseau went to Rome, where he spent some years in painting the ancient ruins, together with the surrounding landscapes.
[2] Rousseau was also employed to paint architectural subjects and landscapes in the palace of Hampton Court, where many of his decorative panels still exist.
[1] Examples of his work are in the British Museum, Windsor Castle, Boughton House (Northants) and Aston Hall (Birmingham).
Besides being a painter in oil and fresco Rousseau was an etcher of some ability; many etchings by his hand from the works of the Annibale Caracci and from his own designs still exist; they are vigorous, though coarse in execution.