At Istockphoto.com photographers earn $0.28 USD – $5.60 USD per every photo download. But that would be tough to earn if you are not professional, but it doesn’t hurt to give it a try. To apply, you have to fill in your personal data to avoid fraud and 3 samples of your work in various resolutions. Make sure you submit photos which actually belong to you! If your work is approved, you can start working right away. Depending on your uniqueness and the quality of your photo, you can make different amount of money, but basically you get ~1$ per every photo download. So make some unique photos and start earning today!!!