1. A method of acquiring an improved image based on tracking a face in a preview image stream with a digital image acquisition device, comprising programming a processor to perform the following: determining an initial location or size, or both, of a face in a first preview image of a preview image stream; determining a subsequent location or size, or both, for the same face in a subsequent preview image; based on the initial and subsequent locations or sizes, or combinations thereof, predicting a region of a third preview image which has just been acquired within which region the same face is expected to occur again; and analyzing one or more characteristics of said region of said third preview image; based on the analyzing of the one or more characteristics of said region, adjusting one or more acquisition parameters of a main acquired image.