That was obviously a mirror.
And it would have been even more obvious to him. Doesn't he realise paintings don't have parallaxing? Why couldn't he see the woman standing in front of the painting in his peripheral vision? Didn't he realise that the woman's face didn't match the rest of the painting? Didn't he recognise the woman when he saw her later on in the movie? This is the biggest plot hole ever and ruined the movie for me because I noticed it right at the start so I knew who the killer was for the whole movie.
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