Why aren't there any pictures of earth from space only computer generated?

I don't know what search terms you are using, but there are lots and lots of photos of the Earth from space, both the complete planet and parts of it, taken by astronauts and automatic satellites. The most iconic is 'Earthrise' taken from Apollo 8. Try that as a search term. There are pictures of earth from space. They were taken by the Apollo rockets. One that was seen everywhere was shot from the 1969 moon landing. You may have seen it and assumed it wasn't real.