This isn't life, this is art. Someone drew/computerized that image, down to the last detail. I highly doubt that in making that shading of the moon that coincidentally it is the exact outline of Griever's face.
Well, that's disputable. Was it really "art", and did whoever draw it really pay attention to every single little detail?

I don't know, I can see how you think it looks like Griever, but it's just too random for me to consider Square actually putting it in there on purpose.