At first, as your peruse the people images that are available for sale on stock photography websites, they may seem boring. But, keep in mind that you will likely need to add something to the photo for your particular use -- a logo, additional image or tagline. Therefore, photos that may seem generic at first may actually be the best people images to buy.
Generic photos are adaptable, whereas lots of background objects in a camera shot detract from the message particular people images might convey to your audience. Background objects also distract the viewer from the main subject, the person and his or her expression.