ANSWER: I would say that this is prohibited if there was no legitimate reason for that.

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ANSWER: Where is the money coming from? If it is coming from ads that you allowed them to put on your account so that people would see, this is haram if the ads contain music, women or haram content.

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ANSWER: If by endorsing such products you are asking the people to go and check their sites with all them models on it, this is not permissible as you are collaborating with them on their evils and vice. 

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ANSWER: No problem in putting such photos of living scholars though I do not like it nor recommend it.

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