If you're using an image to sell something, it has value. If it didn't, you'd use something else. That's why you must pay for photo usage.
New York City's Freelance Isn't Free Act would require all work to be under written contract, impose civil and criminal penalties for payments after 30 days, and allow for the awarding of double damages plus attorney fees for cases that end up in court. Read more: http://bit.ly/1TdSkCS Link