ANSWER: Of course this is sinful. They must take down such pictures if they did not know and repent to Allah while showing deep remorse and sincerity as this dfies the purpose of hijab.

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ANSWER: This is not appropriate because it would bring back memories and satan might make you fall back into that sin again 

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ANSWER: This is the sunnah and that is why we say it and probably it can be for whatever one was distracted from during his prayer. 

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