I would assume the art style. I personally love the feel of 80s-90s fantasy art, the type you used to see on the covers of cheap books or all RPGs. I feel there's something less classic-looking about works like this:>>7000415
...but I can't really tell what it is. Modern games like Dragon Age: Origins or Pillars have something in common with each other in terms of aesthetics anyway, and I don't like them as much as the more classic style. Maybe its that they just sort of look like what they really are, that is, digital paintings instead of organic ones?