Secular portraits Van Eyck was highly sought after as a portrait artist. Growing affluence across northern Europe meant that portraiture was no longer the preserve of royalty or the high aristocracy. An emerging merchant middle class and growing awareness of humanist ideas of individual identity led to a demand for portraits. Van Eyck's portraits are characterized by his manipulation of oil paint and meticulous attention to detail; his keen powers of observation and his tendency to apply layers of thin translucent glazes to create intensity of color and tone. He pioneered portraiture during the 1430s and was admired as far away as Italy for the naturalness of his depictions. Today, nine three-quarters view portraits are attributed to him. His style was widely adopted, most notably by van der Weyden, Petrus Christus and Hans Memling. The small Portrait of a Man with a Blue Chaperon of c. 1430 is his earliest surviving portrait. It evidences many of the elements that were to become standard in his portraiture style, including the three-quarters view (a type he revived from antiquity which soon spread across Europe), directional lighting, elaborate headdress, and for the single portraits, the framing of the figure within an undefined narrow space, set against a flat black background. It is noted for its realism and acute observation of the small details of the sitter's appearance; the man has a light beard of one or two days' growth, a reoccurring feature in van Eyck's early male portraits, where the sitter is often either unshaven, or according to Lorne Campbell "rather inefficiently shaved". Campbell lists other van Eyck unshaven sitters; Niccolò Albergati (1431), Jodocus Vijdt (1432), Jan van Eyck? (1433), Joris van der Paele (c. 1434–1436), Nicolas Rolin (1435) and Jan de Leeuw (1436). Notes made on the reverse of his paper study for the Portrait of Cardinal Niccolò Albergati provide insight into Eyck's approach to minute detaing of his sitter' faces. Of his detailing of beard growth he wrote, "die stoppelen vanden barde wal grijsachtig" (the stubble of the beard grizzled). On the other aspects of his attempts to record the old man's face he noted, "the iris of the eye, near the back of the pupil, brownish yellow. On the contours next to the white, bluish ... the white also yellowish ..." The Léal Souvenir portrait of 1432 continues the adherence to realism and acute observation of the small details of