For example, a product review I did in December of 2014 led people to the product on Amazon via an affiliate link. That product sold extremely well, and people also bought other things well they were shopping. That affiliate link earned me a pretty penny. Of course, that’s not always sustainable. In January and February I earned $300 and $400 respectively from affiliate sales. In March, I only earned $50.
Make use of people to give your images life and scale. If the facade of a particular building appeals to you, the picture may be that much better if you show people walking in front of it. They will give it scale and also let viewers know what sorts of people live there, how they dress, and the like. An outdoor café may be more interesting crowded with people than empty.