this was because the Bible was for Rembrandt "a kind of diary, an account of moments in his own life". Among the more prominent characteristics of Rembrandt's work are his use of chiaroscuro, the theatrical employment of light and shadow derived from Caravaggio, or, more likely, from the Dutch Caravaggisti but adapted for very personal means. Also notable are his dramatic and lively presentation of subjects, devoid of the rigid formality that his contemporaries often displayed, and a deeply felt compassion for mankind, irrespective of wealth and age. His immediate family—his wife Saskia, his son Titus and his common-law wife Hendrickje—often figured prominently in his paintings, many of which had mythical, biblical or historical themes. Periods, themes and styles Throughout his career, Rembrandt took as his primary subjects the themes of portraiture, landscape and narrative painting. For the last, he was especially praised by his contemporaries, who extolled him as a masterly interpreter of biblical stories for his skill in representing emotions and attention to detail. Stylistically, his paintings progressed from the early "smooth" manner, characterized by fine technique in the portrayal of illusionistic form, to the late "rough" treatment of richly variegated paint surfaces, which allowed for an illusionism of form suggested by the tactile quality of the paint itself. A parallel development may be seen in Rembrandt's skill as a printmaker. In the etchings of his maturity, particularly from the late 1640s onward, the freedom and breadth of his drawings and paintings found expression in the print medium as well. The works encompass a wide range of subject matter and technique, sometimes leaving large areas of white paper to suggest space, at other times employing complex webs of line to produce rich dark tones. Lastman's influence on Rembrandt was most prominent during his period in Leiden from 1625 to 1631. Paintings were rather small but rich in details (for example, in costumes and jewelry). Religious and allegorical themes were favored, as were tronies. In 1626 Rembrandt produced his first etchings, the wide dissemination of which would largely account for his international fame. In 1629 he completed Judas Repentant, Returning the Pieces of Silver and The Artist in His Studio, works that evidence his interest in the handling of light and variety of paint application, and constitute the first major progress in his development as a painter. During his early years in Amsterdam (1632–1636), Rembrandt began to paint dramatic