Just because it is widely used does not mean it's not a copyright violation. Someone took the photo, and they own the copyright to it. Unless you have an explic

Just because it is widely used does not mean it's not a copyright violation. Someone took the photo, and they own the copyright to it. Unless you have an explicit license from that copyright holder, then most likely you are violating the copyright. Additionally, you don't have a model release from the woman, and since you are using her image for commercial purposes, you could be liable and she would have a pretty good case, especially considering that it is a published fact that her image is more effective.