I would rather make my own Undead Arthas w/o horse skin than downloading others because it is simple to do that.
Otherwise, there should be a model that looks exact like Undead Arthas with horse somewere, or do I have wrong?
This one has the face messed up so it's a minus there. The model makes it also not Undead looking (more like a happy Arthas in his old age).
There's what I think is a good model of a unmounted DK (not Arthas, a DK) somewhere here. But the trouble is that it doesn't have any portrait. And there's another one here, also, with the protrait and, guess what, the holy book!