A simple, effective approach is to build the collage in GIMP using each photo on its own layer, then arrange them in a visually pleasing layout—such as a timeline, grid, or overlapping pattern that shows the person growing up over time.

If you want an easier starting point, one community suggestion was to use an online collage maker such as Photovisi for layout ideas or templates, then recreate something similar in GIMP if you want more control.

In GIMP, the basic workflow is:

• create a new canvas large enough for the final print or image
• import each passport photo as a separate layer
• scale and crop them consistently
• arrange them by age or in a decorative pattern
• add borders, a background, or captions/dates if desired
• export the final image for printing or sharing

If you want a more polished result, look for GIMP collage tutorials that cover layer positioning, borders, drop shadows, and masking. Those techniques are usually enough to turn small passport photos into a neat single-image montage.