In the third picture, if you look in the bottom left and right corners, you can see a sudden colour change along the lines where the original picture's content

In the third picture, if you look in the bottom left and right corners, you can see a sudden colour change along the lines where the original picture's content ended. On the right, for example, the original cloud is sort of yellowish, then it suddenly becomes a more neutral grey along a diagonal line. In the sky it's harder to tell, but it's still there too.