You have already established that different conditions etc lead to differences in the appearance of the atmosphere...
You're saying I established that different conditions etc. can lead to the total apparent absence of the blue atmospheric layer? Please quote where I established this.
You have accepted the much more obvious difference between the appearance of the atmosphere over the planet's dark side in the ISS video and the low earth orbit photographs without comment.
I have accepted that the earth exhibits a visible atmosphere, even at night. How exactly does this mean I've established that different conditions etc. can lead to the total absence of a visible atmospheric layer?
The odd thing about your original post is that you've then gone on to suggest that differing appearance means that the "blue marble" photograph is in some way fake. That's a big claim for you to make, and doing so on the basis that it looks a bit different to you doesn't really cut it.
My claim isn't that it merely looks different, but that it is totally absent; it is on the basis of this inconsistency that I am positing it must be an artist's rendering. Incidentally, a corollary to this position is that all images of the earth that depict this absence must also be artistic renderings.
You need to re-read the thread. You are not at all getting what is being discussed here.
You didn't establish that different conditions can lead to the "total apparent absence of the blue atmospheric layer." You did establish that the atmosphere looks different when photographed under different conditions, and you did that when - not to put too fine a point on it - you posted photographs and film of the atmosphere looking different under different conditions.
You've then gone on to make the following additional claims:
1. That there is a "total absence of a visible atmospheric layer" in the "blue marble" photograph;
2. That as a result, it must be an artist's rendering; and
3. That any photograph which also lacks a visible atmospheric layer is also an artist's rendering.
Looking at your first claim, various posters have tried to help you out by explaining why the "blue marble" image doesn't look the way you expect it to. You've shown no curiosity in those explanations, which I think is odd, because you are clearly interested in the photograph itself. So it might help to recap how you came to be looking at that image. It was taken by a bloke who wasn't a professional photographer through a tiny window of an object which was 29,000km away. It has probably been scanned from a print to get it on the internet, and finally you're viewing the image on a computer screen with a finite limit to the amount of resolution it is able to offer. Every step in the process will tend to degrade the resolution of the image that is available to you. You can't reasonably make your second and third claims until you've looked into the factors that might have affected how the atmosphere appears on the "blue marble" photograph first. I hope that helps.