Are you seriously claiming that is authentic? OMG!
Do you have evidence that it is not? If so, cite it. If not, why is your assumption that it is not authentic any more trustworthy than my assumption that it is? If you have evidence that it is not authentic, offer it. Otherwise, can the innuendo. It only reveals your prejudice. When someone offers evidence the photo is a fake, I’ll change my assumption. But I won’t change it based on your assumption to the contrary.