They should be taken from a front view.
Head size should be 32-36mm
If they need a digital copy it needs to be 600 dpi & 827×1063 Pixels.
In the case of babies the eyes need to be open
Make sure photo presents full head from top of hair to shoulders.
Avoid shadows on the face or background.
Face in photo should have a natural expression (closed mouth).
Photos should not include sunglasses or hats.
The contrast and lighting in the photo should be normal.