In the present study, intraindividual development of the ability to modify the size of the human figure drawing was investigated. In a longitudinal data set with repeated measurement at ages 7, 9, and 12 it was shown that size was reduced between 7 and 9 years. Three factors were found to be responsible for size variation of the human figure drawing: The larger the figure initially, the more complex the level of the spatial axes system and the more persons in the picture, the greater size reduction.