His technique is defined by a specific treatment of nature. He often painted trees with thin, feathery leaves that catch the light in a way that feels almost weightless. Unlike the heavy oaks of his contemporaries, Pynacker’s trees appear delicate. He used a cool, refined colour palette to create a sense of atmosphere. His compositions often include ruins or mountainous terrain, blending Dutch precision with the warmth of the Roman Campagna.

Modern collectors value these works for their ability to bring a sense of air and space into a room. The small scale of many of his paintings makes them suitable for contemporary interiors. His focus on the picturesque provides a decorative quality that remains popular. The balance between detailed botanical observation and idealised golden light allows these prints to work well in both traditional and modern settings.