In addition to technical quality, iStock judges images on their suitability as stock. Stock images need to be useful to designers. An image is suitable as stock when it has a well-defined subject, care has gone into the composition, and it describes or shows an object or concept clearly. The difference between a stock photograph and a snap shot comes down to the thought and direction that goes in before hand.
Images may come in a variety of concepts or literal representations. They may demonstrate different degrees of technical execution and overall production. However, if an image is just thrown together – a snapshot – then it won't work at all for a designer and is not suitable for iStock.
Before you press the shutter, think about your topic and what you're trying to create. Have a clear idea and try to execute it in the best way possible.
Please read this article for more examples of useful stock images and snapshots.
4.0 Quality Standards
6.0 Title, Description & Keywords
8.0 Model & Property Releases