Make sure that there’s no ‘red eye’ effect in the photo. Especially the colour of the iris must be visible. Eyes When posing you have to have your eyes open and visible. The mouth must be closed and the head must be kept straight (do not tilt it in any side!). Keep your facial expressions plain, neutral. Half-profile photos are not accepted and will result in application rejection. You have to stand straight for the camera and look directly into the lens.
The positioning of the face and body in the photo for passport/visa photo is very important. UK Passport Face and Posture Requirements
