Many people use their blogs borrowing. But they forget to insert in their posts a link to the author. It is theft. We must respect the author's work, especially if you want to make money on this.
Especially it concerns the publication of photos. You are thinking how much money is spent on the photo and the photographer? He needs to buy a camera, expensive lens to it. He had rented a studio, or fly in a beautiful place. All of this costs money.
And you just want to get money by publishing someone else's photo?
Please respect the work of others. Insert at least a reference to the author.