1. A computer system for grouping faces in large user account for creating an image product, comprising: a computer processor configured to select a first portion of face images from a user's account to add to a first chunk, wherein the first portion of face images is selected to keep chuck size of the first chunk in an optimal chunk size range, wherein the computer processor is configured to automatically grouping face images in the first chunk to form face groups, to assign at least some of the face groups in the first chunk to known face models associated with the user account, to move the ungrouped face images in the first chunk to one or more subsequent chunks that have not been processed with face grouping, to discard ungrouped face images that have been moved to subsequent chunks for more than a predetermined number of times, and to create a design for an image-based product based at least in part on the face images in the first chunk associated with the face models.