A pastoral Portrait of a young Man as a Shepherd playing a Flute; and A pastoral Portrait of a young Woman as a Shepherdess, holding a letter and a floral wreath, her dog nearby

Presumably portraits of a newly-wed couple. Pastoral portraiture was rather popular among well-to-do citizens, who wanted to escape the hassle of city life. The thistle in the foreground of the man's portrait and the dog in the woman's are symbols of marital faith. A comparable pair of wedding portraits by the artist in pen and brown ink on vellum, signed and dated 1634, is in the Groninger Museum voor Stad en Lande, Groningen, J. Bolten, Dutch Drawings from the Collection of Dr. C. Hofstede de Groot, Utrecht, 1967, nos. 38-9, illustrated.
The artist would seem to have signed varying his first name using Guillaume or Willem. He mostly worked on vellum, and usually depicted scenes with farmers and country folk.
Most recently, the subject of the pastoral scene was discussed in the exhibition catalogue Het Gedroomde Land, pastorale schilderkunst in de Gouden Eeuw, Zwolle/Utrecht, 1993.