Generally, you should credit Shutterstock when using images for merchandise as long as it’s “commercially reasonable.” It can be challenging to figure out how to include this credit for some merchandise. The attribution should be in this format: “Image(s) used under license from Shutterstock.com.”
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).