Here's a good one, not NASA, the Russian Elektro-L.
That's a very beautiful image. There are lots of features of it that blue-marble doesn't have.
Look, for example at the ocean just above Madagasgar - off the East coast of Africa. There is a whiter patch. That's a reflection of the sun - think about the angle of incidence and angle of reflection off of the round surface - and that the sun must be over to the left - and there you have it. It's not a nice perfect reflection because the ocean is full of waves - and that diffuses and softens the image.
Look along the 'terminator' (the line between day and night) - you can see the clouds look 'bumpier' - but that's because the light is landing on them edge-on and the higher bits are casting shadows onto the lower bits, giving a more three-dimensional appearance.
You can even see subtle red tints on the edges of the clouds to the west of the terminator - and where the tops of the highest clouds are still catching the sunlight on the east of the terminator (especially around the south pole)...and those clouds are tinted yellow because the sunlight is passing through a great deal of atmosphere at that angle, and so the scattering of the blue light that makes the sky blue has leached out blue light from the white sunlight - leaving it yellow in color.
The swirl of clouds at the bottom-center of the picture is a spinning in the direction that southern-hemisphere coriolis effect would cause it to swirl.
The eastern edge of Lake Tanganyika is outlined in white cloud - actually, it's fog - which is a daily event there - it provides just enough mid-morning moisture for "air plants" to grow on trees there without needing roots.
If you look on the very tip of the arabian peninsula - on the east coast - you can see a tiny puff of white cloud, which is where the evaporation from the vast artificial irrigation systems of Dubai has drifted over the mountains of Jebel al Harim - been pushed up to higher altitudes and in condensing into cloud.
So if this is a fake it's a truly spectacularly good one - someone took a LOT of trouble to make the details just picture perfect, and to reproduce exactly what you'd expect to see on a round earth...or maybe it's not a fake after all!