Well, part of the skin looking too even is that there’s no shadows in the face. You’re not gonna do that in Photoshop and I’d expect a filter to at least try to preserve your face looking like it’s real, too.

But yeah, ultimately I’m just naming noticeable aspects, while it’s really just an Uncanney Valley feeling that haunts me when looking at that freakshow of a face.
There’s probably tons of minor details slightly off, which I cannot name individually, but which I subconsciously pick up on and because humans train their whole lives to notice small changes in a face (a.k.a. emotions), it just ends up looking creepy as hell.