You can sell other people’s photos only with their written permission to do so. If you sell other people’s photos or even offer other people’s photos without written permission, a contract or a release then it is very likely you will be forced to stop selling them, you will also have to pay fines for doing this.
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).