Well, I'm not totally sure of coarse, but it 
looks like the Sketch is real, most people have 
agreed on that. But in my opinion, and many 
others, the cel looks fake. I think that someone, 
not necessarily the person selling it right now, 
but someone who owned the sketch, used it to make 
a fan cel. If he traced over the sketch lines 
perfectly, that would also explain why the sketch 
# and the Cel # look 100% identical. Any way, 
that's what I think.