He was allowed to work on the less important areas of the master 's own paintings such as large areas of unmodulated color or monotonous areas of foliage in the background . The master closely followed his pupil 's progress and corrected him when needed . Some extremely talented artists were able to leave the master 's studio within a few years . Rembrandt progressed so rapidly that he already had pupils of his own at the age of 21 . An apprentice 's...











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