There are two ways that a blurry photograph can be your downfall. The main way is that the whole photo is out of focus. A shaky hand, an automatic focus struggling with the subject matter, a manual focus that is a bit off. Regardless of why the image is out of focus, if it is blurry, it is no good.
What Sells Best On Shutterstock?
Some types of photos that sell best are Portrait Photography, Food Photography, Landscapes (usually with people) and fine art photography (artsy).