It is a very interesting picture and thanks for sharing
I have had something similar happen!
My partner had a mobile phone that he kept on the bedside table for an alarm clock, it had no sims card or wifi. From memory, he turned off the alarm and went into the bathroom, when he came back the phone alarmed again; when he lifted the phone there was a picture on the display screen. Since neither of us knew where it came from he thought I had taken it while he went to the bathroom. It even showed it was a current picture, by the time stamp on the picture. I won't say what he thought the picture was of, but I could see something completely different to him and the only thing we both agreed on was neither of us took the picture.
That was quite a while ago now and we are both in the land of the living; if that is of any comfort to you
Also, your mum said you are seeing dark figures around the place, I have read different things on these anomalies and personally I don't believe 'dark' necessary defines something as evil. Please keep us posted.