The 1st image, second image and 4th image are all renderings of the earth from low earth satellites that cannot see all of the earth a once. It is thousands of images stitched together. That is why they had to photoshop the coulds; it would look worse without it. The 3rd image you notice had no photoshopped anything's, has the correct size of the continents, and is a different color. This is because the 3rd image is the first "full" image of the earth since the Apollo moon landings.