A few reasons such as the lighting and brush work aren't very defined. And at times, the characters look unnaturally stiff. And the aesthetic doesn't lend at too well to the game's more mature art direction. While most of the art done by Nomura, Noara, Kamikokuryo, are consistent with a theme that's dark, exaggerated realism. Even Roberto Ferrari's art style, which both complements and is reminiscent of Nomura's, lends itself better. It isn't that big a deal, I just have a particular interest in conceptual art and design.
I think that this piece gives me a better sense of the atmosphere and tone of it's scene. It's also aesthetically pleasing.