Some how I doubt that would even be a bitmap. I would assume that it would have to be an animated image that was a video from a truly 3-D environment. Anyway, as Crys pointed out, it probably is fake. However, I don't know if this is to get Nintendo to do it or if it is to make us disappointed. Also, this looks more like the mid-19th century, rather than the late 20th/early 21st century.
Perhaps it should also have a very slight green tint to aid in with the Yoshi ghost effect. This looks good otherwise. Also, if you can, are you going to make Mario a ghost eventually (with diffent hazards like others looking at you) to make this hack stick out or are you going to do nothing of the kind? You could make it, so that "ghost mushrooms" are spread out to the beginning of all the levels if everybody is revived.