1. A computer-implemented method of grouping faces in large user account for creating an image product, comprising: selecting, by a computer processor, 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; automatically grouping face images in the first chunk by the computer processor to form face groups; assigning at least some of the face groups in the first chunk to known face models associated with the user account; moving the ungrouped face images in the first chunk to one or more subsequent chunks that have not been processed with face grouping; and creating 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.