Good Photo vs Bad Photo
This is the same photo, but digital distortion was added to simulate what an unacceptable photo looks like. When you zoom in all detail is lost. This image cannot be reproduced without completely guessing.
The End Result
Hopefully the examples above help visually demonstrate the differences between a good clean photograph versus a distorted pixelated one. Because the client provided a good clean photo and there was no guesswork, the end result was a painted portrait the client loved.