The difference between a “good” photo and a “bad” photo is subjective, but a “marketable” image is easier to define. The market for stock images is growing rapidly, but while trends come and go, there are a few key ingredients that always make a photo stand out. For starters, all best-selling photos tell a story. They convey a clear and simple message, and they can be used for multiple purposes. Luckily, just a few simple changes can elevate a “good”…