Here's one the four cards modified: Scab-Clan Mauler. The art has a skull in the foreground, which was altered very subtly so as to obscure the nose cavity of the skull.
Scab-Clan Mauler
Scab-Clan Mauler art by Liam Sharp
The final piece modified for the Chinese market was, of course, Skeletal Vampire. The very concept of the card is a bare skeleton shown front-and-center, so it obviously needed modification. The resulting art is dramatic but still cool-looking -- click the links below to see the image change.
Original art | Chinese alternate art |
As you can see, the art team did a nice job of covering up our bony friend while keeping the sense that he's a relentless -- and still reasonably skeletal -- bloodsucker.