An image generation system includes: a detection unit that detects a position information about a position of a face or a position of a feature point of the face from an image; an acquisition unit that obtains a perturbed position information that takes into account an error that occurs when the position information is detected, for the position information; and a generation unit that generates a new image including the face on the basis of the perturbed position information. According to such an image generation system, it is possible to properly generate a new image in view of the error in position estimation.