Photoshop has several crop overlays, they could be even more useful if they existed with the ratios needed for the some of the most used like the EU or US passport, especially the height of the eyes, and the size of the head:
- 2 x 2 inches (51 x 51 mm)
- Head must be between 1 -1 3/8 inches (25 - 35 mm) from the bottom of the chin to the top of the head
Likewise, the European passport specs: https://www.schengenvisainfo.com/photo-requirements/
especially when it comes to the area that the head should cover -32 to 36mm