I was trying to be clever today and not be seen in the mirror, the white frame, however to do that I needed to angle the mirror which put the horizontals out. In picture 1 the frame is square but you can see that the balcony is not correct and in picture 2 by correcting the balcony the frame is wrong.
I have also added a third picture just to show what happened when I took a photo without considering the effect of the focus. The theme was mirror and so I should have focussed on that and then the balcony would have been out of focus and given a better impression of it being the view in the mirror. You can see from the picture that I didn’t think and focused on the balcony and didn’t achieve the desired effect – definitely something to be thought about when doing this style of task again.