Didn't try it but I'd expect the same result. Really, you need the ArtDefineTag in the leader xml because that points to the "scene" xml (e.g., Elizabeth_scene.xml). The scene xml then points to the FallbackImage, which is the simple 2D .dds image that you want to display.
OK. I've been playing with this some more. One annoying thing is that it expands the .dds image to fit the screen regardless of image and screen size. So if you try to use a nice little 400 x 600 image, it blows it up to 1920x1200 (if that's your screen size) which doesn't look so good. Wish there was some way to control this.