A huge percentage of ads both in print and online use portraits of someone who is using or endorsing the product or service in the add.
Shutterstock has 134,636 headshots in its collection and
AdobeStock has 156,560. Many of these individual frames show 16 to 25 different headshots in the frame so the total variations is much greater.
Alamy has 107,506 women and 62,011 men headshots.
Getty has a total of 1,156,443 images with the keyword “headshot.”