Hi boilersuit
First you need lots of digital images. I recovered my collection from a rather poor condition collection of slides, negatives and prints that had been stored in cardboard boxes in a damp garage for 20 years. So lots of scanning. Then you crop squares from the digital images to be the 'tiles' of the mosaic. Then you use software which tries to match your tiles with whatever main picture you choose. That gets you to your first draft version!
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