False premise. There are thousands of real photos of the Earth from orbit. Do not ask why before asking if*.
The first pictures of Earth from space were taken on March 7, 1947, using a V-2 rocket. The Apollo astronauts took many pictures of the Earth from far enough away, including from the lunar surface, to see the entire sphere. Since then photos have been taken by dozens of missions. The astronauts on the ISS take pictures almost every day. NASA broadcasts live footage of the Earth from ISS, daily. Brand new photos from far away enough to see the full sphere are available every day at EPIC :: DSCOVR. In February of 1990, Earth had its picture taken from 6 billion kilometers (3.7 billion miles) away.
If, for some bizarre reason, you don’t like digital camera images, there are hundreds of images on film taken by the Apollo astronauts using Hasselblad cameras, such as this image from Apollo 8:
Or this photo from Apollo 17:
Both of these photos are simple scans of the original negatives from the camera.