In the photo, it turned out not an understandable effect on the face.

[Евгений6]

Translation via Google translate:

I can not understand what happened. The photos are taken with a break of 2-3 seconds, from the front of the camera. If you get some effect, help me to repeat it. I ask you to take it seriously, these are my children, the youngest in the middle.

Не могу понять, что произошло. Фото сделаны с перерывом 2-3 секунды, с передней камеры. Если получился какой то эффект, помогите повторить. Прошу отнестись серьёзно, это мои дети, младший по середине. 

[Qatrium]

@Евгений6

I used Google Translate to find the meaning of your message. Kindly post your future questions/feedbacks in English so we can assist you, this is an English based forum.

I guess what happened is that your adorable son moved his head at the same moment of taking the picture, and his movement was faster than the shutter speed of the front camera at this time. I think you can replicate this by taking a selfie while waving your hand, you'll see the same effect.