It doesn't look real, imo. It looks fan-made.
Besides, why have Mewtwo have another form? It's already technically a form of Mew. I mean, I get that there's a new generation and a new movie with Mewtwo, but is it necessary? No, not at all. And it doesn't even look very appealing. Muk looks better than that, and Muk is just a freaking pile of sludge.