The principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety. The use of these principles can help determine whether a painting is successful, and whether or not the painting is finished. The artist decides what principles of art he or she wants to use in a painting.
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).