I'm not going to call myself a great artist or anything but here's a simplified diagram of how your perspective relative to the moon changes how much of the reflection you can see. https://imgur.com/a/hkWd2MG
Unfortunately I'm not able to draw in 3d. But you hopefully begin to see how the earth could find itself "behind" the moon at an angle like the photo of the ball.
I'm not going to call myself a great artist or anything but here's a simplified diagram of how your perspective relative to the moon changes how much of the reflection you can see. https://imgur.com/a/hkWd2MG
And if we were 2 dimensional beings, I would have to relent.
So am I to assume, you did not render the earlier image?
Nope, took a photo in my garage of the ball.
Unfortunately I'm not able to draw in 3d. But you hopefully begin to see how the earth could find itself "behind" the moon at an angle like the photo of the ball.
That would explain how amazingly "high quality" the textures and lighting on this render were.
https://www.youtube.com/watch?v=ca-e5MrVbVU