The yellow outlines are an overlay over a photo. That shouldn't be hard to understand. I would have linked the real-time NASA feed of the earth first, but flat earthers get triggered by any mention of NASA,
But for what it's worth, here's the link to NASA's REAL (Non composite) photos of the earth...
https://epic.gsfc.nasa.gov/
What makes you think that this is CGI? And what would an image of the Earth have to look like for you to not think its fake? Or are you just going to deny every image ever shown to you? In which case there's no point now, is there?