You must send 2 identical photos when applying for a passport.
Photos must be professionally printed and 45 millimetres high by 35 millimetres wide - the standard size used in photo booths in the UK. Standard sizes in photo booths outside the UK can be different - make sure you get the right size.
You can't use photos that have been cut down from larger pictures.
The photos must be:
Photos should show a close-up of your full head and shoulders. It must be only of you with no other objects or people.
The image of your head - from the crown of your head to your chin - must be sized between 29 millimetres and 34 millimetres deep (see example below).
Your photo may be rejected unless it shows you:
Children must be on their own in the picture. Babies must not be holding toys or using dummies.
If the child is under 5, they don't have to be looking directly at the camera or have a neutral expression.
If the child is under 1, their eyes don't have to be open. If their head is supported by a hand, the hand mustn't be visible in the photo.
Source: https://www.gov.uk/photos-for-passports/photo-requirements
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Make Passport/Visa Photo for Other Countries