Hello nidip,
Thank you for reaching out to Apple Support Communities.
We understand you're having issues with a lens flare in your photo. This may happen when a bright source of light is shining through the camera lens, and is a common occurrence in photography. It may be more noticeable the brighter the light source is, and the darker the surrounding environment. If this happens, move the camera slightly to change the position of the light, or shield the lens with your hand.
Let us know if you have any questions.
Thank you for using Apple Support Communities.
Take care!