'Which Face is Real?' Review to see if you can see through real face images of AI and real people

Machine learning has made it possible to automatically create facial images of people who do not exist, and it is pointed out that fraud using fake photos rampant and digital IDs are forged. However, the AI as of 2019 can not create a perfect image, but if you know "where is the difference" it should be possible to see counterfeits. So which one of the two face images is real? Jevin D. West and Carl T. Bergstrom of the University of Washington have published a website that can test that it is.

Which Face is Real?
http://www.whichfaceisreal.com/

When you access the above URL, you will see a screen saying "Click on the person who is real." Click on the person who actually exists. Whatever you look at, neither of them seems to be a picture of the person actually present, but if you try to click on the person on the left somehow ......

"You are incorrect. The image on the right is the real one. (It is wrong, the person on the right is real)" was displayed. The picture of the correct answer is surrounded by a green frame. Click "Play again." ...

A new picture appeared. Click again on the left side.

The correct answer on the left this time. The right side was a fictitious person generated by AI.

What on earth is different ...? I will continue to answer further while thinking. Of the following two pictures, clicking on the right side ... ...

mistake. In reality there was a person on the left. The woman on the right side is realistically beautiful by facial features, but when you look closely you will notice that the female hat is unnatural.

I will continue to answer more and more. Click the following two on the right.

This is correct as well. The picture on the left shows that the main woman is natural but it seems that the person next to it is distorted.

In the case of these two, click on the right.

This is correct as well. Both are natural, but the person on the left side looks somewhat unnatural around the neck. After experiencing some correct / incorrect answers, apparently there seems to be an unnatural part around its facial features.

Also, if it is the following two, the right side is correct. The background of the person on the left side is like an abstract picture, but the person on the right side is characterized by being a very specific thing called a star stripe flag.

This is also the correct answer when I chose the right side on the basis that the concrete scenario "person in the water" is not yet able to make for AI.

Moreover, it is correct answer when choosing the left side from suspicion that "AI can generate a pinpoint person called a cosplayer ...?"? As I continued to solve the problem, the difference between the actual portrait photo and the AI's portrait photograph became to be understood somehow.