JustaNobody - might I point you in the direction of a Google search on the concept of "Fair Use"? Editorial commentary on the differences in artistic representations is most certainly fair use. If, on the other hand, we were trying to pass off the art as belonging to someone else, or trying to sell this art as if we could, then you would have a point.
But, as this is pretty easily covered by fair use, you don't have to worry.