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The lighting is very good.. the scene is very good and realistic. The shadow is tough to guage but it is not unreasonable.. nor necessarily overhead although the margins of the craft's shadow are too well defined as these would lik be diminished by diffuse ambient light evident in the image.
However given the image says "Neff" on it, it is (likely) the work of James Neff who creates fantastic 3D modeled "UFO" and space scenes.
Neff's work is featured on www.rense.com (and that is where this picture is presented, front and center) "Step on it!"