Interested to know where the light is coming from that casts the shadow on the bannister knob...
My guess is that's the on-camera flash which would be just to the left of the viewfinder, therefore casting shadows slightly to the right in the background. Note the matching shadow just to the right of the woman in the far background.
In my early days of wedding work I used a flash bracket with the strobe mounted left of the lens. It would create those unsightly shadows all the time. I finally got a "flash-rotator" bracket" which centered the strobe directly above the lens and eliminated side shadows.


