Photoshopped. If you look at the shadows of the ship and the the people in the foreground they were placed in the picture. Their shadows point in the same direction, which is the light source coming from above approx noon, or the sun's highest point. (though i see a couple shadows skewing left and right slightly)
However, if you look at the shadows of the people in the background they don't match. The light source is coming from the hard left instead from above.
Also if the people in the foreground have casting shadows right beneath them, the sun would be at it's highest peak and shedding more light atop their bodies eg: their head, shoulders, chest, back etc, not having these parts in shade. The shade on their bodies (foreground bodies) in the picture assume the light source is coming from the right.
Whether or not the ship is CGI i guess yes, as they've placed the people and their shadows incorrectly.
In university i had to draw and render buildings and cast shadows by hand (and calculate shadow lengths) for architectural presentation drawings it becomes quite obvious. It ruins a picture when the shadows and shade don't match, especially when it's an outdoor picture with only 1 light source.
The devil is in the details
