Photo © J. Bear
Before: Each image was obviously taken at different times and locations. After: Even with the varied backgrounds (which could be removed) and poses the individuals appear more cohesive, as if each photo was taken under similiar conditions.
Cropping and resizing so that each subject appears to be about the same distance from the camera provides a uniform appearance to a varied group of mug shots. Eyes align and face/body occupy about the same amount of space.