I'm leaning towards:
- Real actor (body, etc.)
- CG head
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That weird shadow glitch just doesn't make sense, and the previous hypothesis about "green screening" doesn't hold any water since the backdrop is an LCD TV as we can see if this "picture" taken of him.
The weirdest thing about the picture is the way his shirt moves when he leans back, in my opinion. Compared to the rest of the motions that give away framerate, relativity of the motions and so forth, it moves "too fluidly". Doesn't necessarily mean it's CG though.